Prototype: 500GiB task queue

3445: Bump milli to v0.41.1 r=curquiza a=dureuill

# Pull Request

## Related issue

Fixes #3438.

## What does this PR do?
- Bump milli to [v0.41.1](https://github.com/meilisearch/milli/releases/tag/v0.41.1) that includes a bugfix for #3438 

Co-authored-by: Louis Dureuil <louis@meilisearch.com>

.dockerignore

@@ -0,0 +1,4 @@
+target
+Dockerfile
+.dockerignore
+.gitignore

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,30 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Meilisearch version:** [e.g. v0.20.0]
+
+**Additional context**
+Additional information that may be relevant to the issue.
+[e.g. architecture, device, OS, browser]

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,13 @@
+contact_links:
+  - name: Support questions & other
+    url: https://github.com/meilisearch/meilisearch/discussions/new
+    about: For any other question, open a discussion in this repository
+  - name: Language support request & feedback
+    url: https://github.com/meilisearch/product/discussions/categories/feedback-feature-proposal?discussions_q=label%3Aproduct%3Acore%3Atokenizer+category%3A%22Feedback+%26+Feature+Proposal%22
+    about:  The requests and feedback regarding Language support are not managed in this repository. Please upvote the related discussion in our dedicated product repository or open a new one if it doesn't exist.
+  - name: Any other feature request & feedback
+    url: https://github.com/meilisearch/product/discussions/categories/feedback-feature-proposal
+    about: The feature requests and feedback regarding the already existing features are not managed in this repository. Please open a discussion in our dedicated product repository
+  - name: Documentation issue
+    url: https://github.com/meilisearch/documentation/issues/new
+    about: For documentation issues, open an issue or a PR in the documentation repository

.github/dependabot.yml

@@ -0,0 +1,13 @@
+# Set update schedule for GitHub Actions only
+
+version: 2
+updates:
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    labels:
+      - 'skip changelog'
+      - 'dependencies'
+    rebase-strategy: disabled

.github/scripts/check-release.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# check_tag $current_tag $file_tag $file_name
+function check_tag {
+  if [[ "$1" != "$2" ]]; then
+      echo "Error: the current tag does not match the version in $3: found $2 - expected $1"
+      ret=1
+  fi
+}
+
+ret=0
+current_tag=${GITHUB_REF#'refs/tags/v'}
+
+toml_files='*/Cargo.toml'
+for toml_file in $toml_files;
+do
+    file_tag="$(grep '^version = ' $toml_file | cut -d '=' -f 2 | tr -d '"' | tr -d ' ')"
+    check_tag $current_tag $file_tag $toml_file
+done
+
+lock_file='Cargo.lock'
+lock_tag=$(grep -A 1 'name = "meilisearch-auth"' $lock_file | grep version | cut -d '=' -f 2 | tr -d '"' | tr -d ' ')
+check_tag $current_tag $lock_tag $lock_file
+
+if [[ "$ret" -eq 0 ]] ; then
+  echo 'OK'
+fi
+exit $ret

.github/scripts/is-latest-release.sh

@@ -0,0 +1,48 @@
+#!/bin/sh
+
+# Used in our CIs to publish the latest Docker image.
+
+# Checks if the current tag ($GITHUB_REF) corresponds to the latest release tag on GitHub
+# Returns "true" or "false" (as a string).
+
+GITHUB_API='https://api.github.com/repos/meilisearch/meilisearch/releases'
+PNAME='meilisearch'
+
+# FUNCTIONS
+
+# Returns the version of the latest stable version of Meilisearch by setting the $latest variable.
+get_latest() {
+    # temp_file is needed because the grep would start before the download is over
+    temp_file=$(mktemp -q /tmp/$PNAME.XXXXXXXXX)
+    latest_release="$GITHUB_API/latest"
+
+    if [ $? -ne 0 ]; then
+        echo "$0: Can't create temp file."
+        exit 1
+    fi
+
+    if [ -z "$GITHUB_PAT" ]; then
+        curl -s "$latest_release" > "$temp_file" || return 1
+    else
+        curl -H "Authorization: token $GITHUB_PAT" -s "$latest_release" > "$temp_file" || return 1
+    fi
+
+    latest="$(cat "$temp_file" | grep '"tag_name":' | cut -d ':' -f2 | tr -d '"' | tr -d ',' | tr -d ' ')"
+
+    rm -f "$temp_file"
+    return 0
+}
+
+# MAIN
+current_tag="$(echo $GITHUB_REF | tr -d 'refs/tags/')"
+get_latest
+
+if [ "$current_tag" != "$latest" ]; then
+    # The current release tag is not the latest
+    echo "false"
+else
+    # The current release tag is the latest
+    echo "true"
+fi
+
+exit 0

.github/workflows/create-issue-dependencies.yml

@@ -0,0 +1,23 @@
+name: Create issue to upgrade dependencies
+on:
+  schedule:
+    - cron: '0 0 1 */3 *'
+  workflow_dispatch:
+
+jobs:
+  create-issue:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Create an issue
+      uses: actions-ecosystem/action-create-issue@v1
+      with:
+        github_token: ${{ secrets.MEILI_BOT_GH_PAT }}
+        title: Upgrade dependencies
+        body: |
+          We need to update the dependencies of the Meilisearch repository, and, if possible, the dependencies of all the engine-team repositories that Meilisearch depends on (milli, charabia, heed...).
+
+          ⚠️ This issue should only be done at the beginning of the sprint!
+        labels: |
+          dependencies
+          maintenance

.github/workflows/flaky.yml

@@ -0,0 +1,26 @@
+name: Look for flaky tests
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 12 * * FRI" # Every Friday at 12:00PM
+
+jobs:
+  flaky:
+    runs-on: ubuntu-latest
+    container:
+      # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
+      image: ubuntu:18.04
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install needed dependencies
+      run: |
+        apt-get update && apt-get install -y curl
+        apt-get install build-essential -y
+    - uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        override: true
+    - name: Install cargo-flaky
+      run: cargo install cargo-flaky
+    - name: Run cargo flaky 100 times
+      run: cargo flaky -i 100 --release

.github/workflows/latest-git-tag.yml

@@ -0,0 +1,29 @@
+# Create or update a latest git tag when releasing a stable version of Meilisearch
+name: Update latest git tag
+on:
+  workflow_dispatch:
+  release:
+    types: [released]
+
+jobs:
+  check-version:
+    name: Check the version validity
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Check release validity
+        if: github.event_name == 'release'
+        run: bash .github/scripts/check-release.sh
+
+  update-latest-tag:
+    runs-on: ubuntu-latest
+    needs: check-version
+    steps:
+      - uses: actions/checkout@v3
+      - uses: rickstaa/action-create-tag@v1
+        with:
+          tag: "latest"
+          message: "Latest stable release of Meilisearch"
+          # Move the tag if `latest` already exists
+          force_push_tag: true
+          github_token: ${{ secrets.MEILI_BOT_GH_PAT }}

.github/workflows/milestone-workflow.yml

@@ -0,0 +1,154 @@
+name: Milestone's workflow
+
+# /!\ No git flow are handled here
+
+# For each Milestone created (not opened!), and if the release is NOT a patch release (only the patch changed)
+# - the roadmap issue is created, see https://github.com/meilisearch/engine-team/blob/main/issue-templates/roadmap-issue.md
+# - the changelog issue is created, see https://github.com/meilisearch/engine-team/blob/main/issue-templates/changelog-issue.md
+
+# For each Milestone closed
+# - the `release_version` label is created
+# - this label is applied to all issues/PRs in the Milestone
+
+on:
+  milestone:
+    types: [created, closed]
+
+env:
+  MILESTONE_VERSION: ${{ github.event.milestone.title }}
+  MILESTONE_URL: ${{ github.event.milestone.html_url }}
+  MILESTONE_DUE_ON: ${{ github.event.milestone.due_on }}
+  GH_TOKEN: ${{ secrets.MEILI_BOT_GH_PAT }}
+
+jobs:
+
+# -----------------
+# MILESTONE CREATED
+# -----------------
+
+  get-release-version:
+    if: github.event.action == 'created'
+    runs-on: ubuntu-latest
+    outputs:
+      is-patch: ${{ steps.check-patch.outputs.is-patch }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Check if this release is a patch release only
+        id: check-patch
+        run: |
+          echo version: $MILESTONE_VERSION
+          if [[ $MILESTONE_VERSION =~ ^v[0-9]+\.[0-9]+\.0$ ]]; then
+            echo 'This is NOT a patch release'
+            echo "is-patch=false" >> $GITHUB_OUTPUT
+          elif [[ $MILESTONE_VERSION =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+            echo 'This is a patch release'
+            echo "is-patch=true" >> $GITHUB_OUTPUT
+          else
+            echo "Not a valid format of release, check the Milestone's title."
+            echo 'Should be vX.Y.Z'
+            exit 1
+          fi
+
+  create-roadmap-issue:
+    needs: get-release-version
+    # Create the roadmap issue if the release is not only a patch release
+    if: github.event.action == 'created' && needs.get-release-version.outputs.is-patch == 'false'
+    runs-on: ubuntu-latest
+    env:
+      ISSUE_TEMPLATE: issue-template.md
+    steps:
+      - uses: actions/checkout@v3
+      - name: Download the issue template
+        run: curl -s https://raw.githubusercontent.com/meilisearch/engine-team/main/issue-templates/roadmap-issue.md > $ISSUE_TEMPLATE
+      - name: Replace all empty occurrences in the templates
+        run: |
+          # Replace all <<version>> occurrences
+          sed -i "s/<<version>>/$MILESTONE_VERSION/g" $ISSUE_TEMPLATE
+
+          # Replace all <<milestone_id>> occurrences
+          milestone_id=$(echo $MILESTONE_URL | cut -d '/' -f 7)
+          sed -i "s/<<milestone_id>>/$milestone_id/g" $ISSUE_TEMPLATE
+
+          # Replace release date if exists
+          if [[ ! -z $MILESTONE_DUE_ON ]]; then
+            date=$(echo $MILESTONE_DUE_ON | cut -d 'T' -f 1)
+            sed -i "s/Release date\: 20XX-XX-XX/Release date\: $date/g" $ISSUE_TEMPLATE
+          fi
+      - name: Create the issue
+        run: |
+          gh issue create \
+            --title "$MILESTONE_VERSION ROADMAP" \
+            --label 'epic,impacts docs,impacts integrations,impacts cloud' \
+            --body-file $ISSUE_TEMPLATE \
+            --milestone $MILESTONE_VERSION
+
+  create-changelog-issue:
+    needs: get-release-version
+    # Create the changelog issue if the release is not only a patch release
+    if: github.event.action == 'created' && needs.get-release-version.outputs.is-patch == 'false'
+    runs-on: ubuntu-latest
+    env:
+      ISSUE_TEMPLATE: issue-template.md
+    steps:
+      - uses: actions/checkout@v3
+      - name: Download the issue template
+        run: curl -s https://raw.githubusercontent.com/meilisearch/engine-team/main/issue-templates/changelog-issue.md > $ISSUE_TEMPLATE
+      - name: Replace all empty occurrences in the templates
+        run: |
+          # Replace all <<version>> occurrences
+          sed -i "s/<<version>>/$MILESTONE_VERSION/g" $ISSUE_TEMPLATE
+
+          # Replace all <<milestone_id>> occurrences
+          milestone_id=$(echo $MILESTONE_URL | cut -d '/' -f 7)
+          sed -i "s/<<milestone_id>>/$milestone_id/g" $ISSUE_TEMPLATE
+      - name: Create the issue
+        run: |
+          gh issue create \
+            --title "Create release changelogs for $MILESTONE_VERSION" \
+            --label 'impacts docs,documentation' \
+            --body-file $ISSUE_TEMPLATE \
+            --milestone $MILESTONE_VERSION \
+            --assignee curquiza
+
+# ----------------
+# MILESTONE CLOSED
+# ----------------
+
+  create-release-label:
+    if: github.event.action == 'closed'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Create the ${{ env.MILESTONE_VERSION }} label
+        run: |
+          label_description="PRs/issues solved in $MILESTONE_VERSION"
+          if [[ ! -z $MILESTONE_DUE_ON ]]; then
+            date=$(echo $MILESTONE_DUE_ON | cut -d 'T' -f 1)
+            label_description="$label_description released on $date"
+          fi
+
+          gh api repos/meilisearch/meilisearch/labels \
+            --method POST \
+            -H "Accept: application/vnd.github+json" \
+            -f name="$MILESTONE_VERSION" \
+            -f description="$label_description" \
+            -f color='ff5ba3'
+
+  labelize-all-milestone-content:
+    if: github.event.action == 'closed'
+    needs: create-release-label
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Add label ${{ env.MILESTONE_VERSION }} to all PRs in the Milestone
+        run: |
+          prs=$(gh pr list --search milestone:"$MILESTONE_VERSION" --limit 1000 --state all --json number --template '{{range .}}{{tablerow (printf "%v" .number)}}{{end}}')
+          for pr in $prs; do
+              gh pr edit $pr --add-label $MILESTONE_VERSION
+          done
+      - name: Add label ${{ env.MILESTONE_VERSION }} to all issues in the Milestone
+        run: |
+          issues=$(gh issue list --search milestone:"$MILESTONE_VERSION" --limit 1000 --state all --json number --template '{{range .}}{{tablerow (printf "%v" .number)}}{{end}}')
+          for issue in $issues; do
+              gh issue edit $issue --add-label $MILESTONE_VERSION
+          done

.github/workflows/publish-binaries.yml

@@ -0,0 +1,191 @@
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 2 * * *' # Every day at 2:00am
+  release:
+    types: [published]
+
+name: Publish binaries to release
+
+jobs:
+  check-version:
+    name: Check the version validity
+    runs-on: ubuntu-latest
+    # No need to check the version for dry run (cron)
+    steps:
+      - uses: actions/checkout@v3
+      # Check if the tag has the v<nmumber>.<number>.<number> format.
+      # If yes, it means we are publishing an official release.
+      # If no, we are releasing a RC, so no need to check the version.
+      - name: Check tag format
+        if: github.event_name == 'release'
+        id: check-tag-format
+        run: |
+          escaped_tag=$(printf "%q" ${{ github.ref_name }})
+
+          if [[ $escaped_tag =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+            echo "stable=true" >> $GITHUB_OUTPUT
+          else
+            echo "stable=false" >> $GITHUB_OUTPUT
+          fi
+      - name: Check release validity
+        if: github.event_name == 'release' && steps.check-tag-format.outputs.stable == 'true'
+        run: bash .github/scripts/check-release.sh
+
+  publish-linux:
+    name: Publish binary for Linux
+    runs-on: ubuntu-latest
+    needs: check-version
+    container:
+      # Use ubuntu-18.04 to compile with glibc 2.27
+      image: ubuntu:18.04
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install needed dependencies
+      run: |
+        apt-get update && apt-get install -y curl
+        apt-get install build-essential -y
+    - uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        override: true
+    - name: Build
+      run: cargo build --release --locked
+    # No need to upload binaries for dry run (cron)
+    - name: Upload binaries to release
+      if: github.event_name == 'release'
+      uses: svenstaro/upload-release-action@2.3.0
+      with:
+        repo_token: ${{ secrets.MEILI_BOT_GH_PAT }}
+        file: target/release/meilisearch
+        asset_name: meilisearch-linux-amd64
+        tag: ${{ github.ref }}
+
+  publish-macos-windows:
+    name: Publish binary for ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    needs: check-version
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-12, windows-2022]
+        include:
+          - os: macos-12
+            artifact_name: meilisearch
+            asset_name: meilisearch-macos-amd64
+          - os: windows-2022
+            artifact_name: meilisearch.exe
+            asset_name: meilisearch-windows-amd64.exe
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        override: true
+    - name: Build
+      run: cargo build --release --locked
+    # No need to upload binaries for dry run (cron)
+    - name: Upload binaries to release
+      if: github.event_name == 'release'
+      uses: svenstaro/upload-release-action@2.3.0
+      with:
+        repo_token: ${{ secrets.MEILI_BOT_GH_PAT }}
+        file: target/release/${{ matrix.artifact_name }}
+        asset_name: ${{ matrix.asset_name }}
+        tag: ${{ github.ref }}
+
+  publish-macos-apple-silicon:
+    name: Publish binary for macOS silicon
+    runs-on: ${{ matrix.os }}
+    needs: check-version
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: macos-12
+            target: aarch64-apple-darwin
+            asset_name: meilisearch-macos-apple-silicon
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Installing Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          target: ${{ matrix.target }}
+          override: true
+      - name: Cargo build
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --release --target ${{ matrix.target }}
+      - name: Upload the binary to release
+        # No need to upload binaries for dry run (cron)
+        if: github.event_name == 'release'
+        uses: svenstaro/upload-release-action@2.3.0
+        with:
+          repo_token: ${{ secrets.MEILI_BOT_GH_PAT }}
+          file: target/${{ matrix.target }}/release/meilisearch
+          asset_name: ${{ matrix.asset_name }}
+          tag: ${{ github.ref }}
+
+  publish-aarch64:
+    name: Publish binary for aarch64
+    runs-on: ${{ matrix.os }}
+    needs: check-version
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - build: aarch64
+            os: ubuntu-18.04
+            target: aarch64-unknown-linux-gnu
+            linker: gcc-aarch64-linux-gnu
+            use-cross: true
+            asset_name: meilisearch-linux-aarch64
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Installing Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          profile: minimal
+          target: ${{ matrix.target }}
+          override: true
+      - name: APT update
+        run: |
+          sudo apt update
+      - name: Install target specific tools
+        if: matrix.use-cross
+        run: |
+          sudo apt-get install -y ${{ matrix.linker }}
+      - name: Configure target aarch64 GNU
+        if: matrix.target == 'aarch64-unknown-linux-gnu'
+        ## Environment variable is not passed using env:
+        ## LD gold won't work with MUSL
+        # env:
+        #   JEMALLOC_SYS_WITH_LG_PAGE: 16
+        #   RUSTFLAGS: '-Clink-arg=-fuse-ld=gold'
+        run: |
+          echo '[target.aarch64-unknown-linux-gnu]' >> ~/.cargo/config
+          echo 'linker = "aarch64-linux-gnu-gcc"' >> ~/.cargo/config
+          echo 'JEMALLOC_SYS_WITH_LG_PAGE=16' >> $GITHUB_ENV
+      - name: Cargo build
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          use-cross: ${{ matrix.use-cross }}
+          args: --release --target ${{ matrix.target }}
+      - name: List target output files
+        run: ls -lR ./target
+      - name: Upload the binary to release
+        # No need to upload binaries for dry run (cron)
+        if: github.event_name == 'release'
+        uses: svenstaro/upload-release-action@2.3.0
+        with:
+          repo_token: ${{ secrets.MEILI_BOT_GH_PAT }}
+          file: target/${{ matrix.target }}/release/meilisearch
+          asset_name: ${{ matrix.asset_name }}
+          tag: ${{ github.ref }}

.github/workflows/publish-deb-brew-pkg.yml

@@ -0,0 +1,57 @@
+name: Publish to APT repository & Homebrew
+
+on:
+  release:
+    types: [released]
+
+jobs:
+  check-version:
+    name: Check the version validity
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Check release validity
+        run: bash .github/scripts/check-release.sh
+
+  debian:
+    name: Publish debian packagge
+    runs-on: ubuntu-latest
+    needs: check-version
+    container:
+      # Use ubuntu-18.04 to compile with glibc 2.27
+      image: ubuntu:18.04
+    steps:
+    - name: Install needed dependencies
+      run: |
+        apt-get update && apt-get install -y curl
+        apt-get install build-essential -y
+    - uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        override: true
+    - name: Install cargo-deb
+      run: cargo install cargo-deb
+    - uses: actions/checkout@v3
+    - name: Build deb package
+      run: cargo deb -p meilisearch -o target/debian/meilisearch.deb
+    - name: Upload debian pkg to release
+      uses: svenstaro/upload-release-action@2.3.0
+      with:
+        repo_token: ${{ secrets.MEILI_BOT_GH_PAT }}
+        file: target/debian/meilisearch.deb
+        asset_name: meilisearch.deb
+        tag: ${{ github.ref }}
+    - name: Upload debian pkg to apt repository
+      run: curl -F package=@target/debian/meilisearch.deb https://${{ secrets.GEMFURY_PUSH_TOKEN }}@push.fury.io/meilisearch/
+
+  homebrew:
+    name: Bump Homebrew formula
+    runs-on: ubuntu-latest
+    needs: check-version
+    steps:
+      - name: Create PR to Homebrew
+        uses: mislav/bump-homebrew-formula-action@v2
+        with:
+          formula-name: meilisearch
+        env:
+          COMMITTER_TOKEN: ${{ secrets.HOMEBREW_COMMITTER_TOKEN }}

.github/workflows/publish-docker-images.yml

@@ -0,0 +1,108 @@
+---
+on:
+  push:
+    # Will run for every tag pushed except `latest`
+    # When the `latest` git tag is created with this [CI](../latest-git-tag.yml)
+    # we don't need to create a Docker `latest` image again.
+    # The `latest` Docker image push is already done in this CI when releasing a stable version of Meilisearch.
+    tags-ignore:
+      - latest
+  # Both `schedule` and `workflow_dispatch` build the nightly tag
+  schedule:
+    - cron: '0 23 * * *' # Every day at 11:00pm
+  workflow_dispatch:
+
+name: Publish tagged images to Docker Hub
+
+jobs:
+  docker:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v3
+
+      # If we are running a cron or manual job ('schedule' or 'workflow_dispatch' event), it means we are publishing the `nightly` tag, so not considered stable.
+      # If we have pushed a tag, and the tag has the v<nmumber>.<number>.<number> format, it means we are publishing an official release, so considered stable.
+      # In this situation, we need to set `output.stable` to create/update the following tags (additionally to the `vX.Y.Z` Docker tag):
+      # - a `vX.Y` (without patch version) Docker tag
+      # - a `latest` Docker tag
+      # For any other tag pushed, this is not considered stable.
+      - name: Define if stable and latest release
+        id: check-tag-format
+        env:
+          # To avoid request limit with the .github/scripts/is-latest-release.sh script
+          GITHUB_PATH: ${{ secrets.MEILI_BOT_GH_PAT }}
+        run: |
+          escaped_tag=$(printf "%q" ${{ github.ref_name }})
+          echo "latest=false" >> $GITHUB_OUTPUT
+
+          if [[ ${{ github.event_name }} != 'push' ]]; then
+            echo "stable=false" >> $GITHUB_OUTPUT
+          elif [[ $escaped_tag =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
+            echo "stable=true" >> $GITHUB_OUTPUT
+            echo "latest=$(sh .github/scripts/is-latest-release.sh)" >> $GITHUB_OUTPUT
+          else
+            echo "stable=false" >> $GITHUB_OUTPUT
+          fi
+
+      # Check only the validity of the tag for stable releases (not for pre-releases or other tags)
+      - name: Check release validity
+        if: steps.check-tag-format.outputs.stable == 'true'
+        run: bash .github/scripts/check-release.sh
+
+      - name: Set build-args for Docker buildx
+        id: build-metadata
+        run: |
+          # Define ownership
+          git config --global --add safe.directory /home/meili/actions-runner/_work/meilisearch/meilisearch
+
+          # Extract commit date
+          commit_date=$(git show -s --format=%cd --date=iso-strict ${{ github.sha }})
+
+          echo "date=$commit_date" >> $GITHUB_OUTPUT
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: getmeili/meilisearch
+          # Prevent `latest` to be updated for each new tag pushed.
+          # We need latest and `vX.Y` tags to only be pushed for the stable Meilisearch releases.
+          flavor: latest=false
+          tags: |
+            type=ref,event=tag
+            type=raw,value=nightly,enable=${{ github.event_name != 'push' }}
+            type=semver,pattern=v{{major}}.{{minor}},enable=${{ steps.check-tag-format.outputs.stable == 'true' }}
+            type=raw,value=latest,enable=${{ steps.check-tag-format.outputs.stable == 'true' && steps.check-tag-format.outputs.latest == 'true' }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          build-args: |
+            COMMIT_SHA=${{ github.sha }}
+            COMMIT_DATE=${{ steps.build-metadata.outputs.date }}
+
+      # /!\ Don't touch this without checking with Cloud team
+      - name: Send CI information to Cloud team
+        # Do not send if nightly build (i.e. 'schedule' or 'workflow_dispatch' event)
+        if: github.event_name == 'push'
+        uses: peter-evans/repository-dispatch@v2
+        with:
+          token: ${{ secrets.MEILI_BOT_GH_PAT }}
+          repository: meilisearch/meilisearch-cloud
+          event-type: cloud-docker-build
+          client-payload: '{ "meilisearch_version": "${{ github.ref_name }}", "stable": "${{ steps.check-tag-format.outputs.stable }}" }'

.github/workflows/rust.yml

@@ -0,0 +1,127 @@
+name: Rust
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    # trying and staging branches are for Bors config
+    branches:
+      - trying
+      - staging
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+  RUSTFLAGS: "-D warnings"
+
+jobs:
+  test-linux:
+    name: Tests on ubuntu-18.04
+    runs-on: ubuntu-latest
+    container:
+      # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
+      image: ubuntu:18.04
+    steps:
+    - uses: actions/checkout@v3
+    - name: Install needed dependencies
+      run: |
+        apt-get update && apt-get install -y curl
+        apt-get install build-essential -y
+    - uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        override: true
+    - name: Cache dependencies
+      uses: Swatinem/rust-cache@v2.2.0
+    - name: Run cargo check without any default features
+      uses: actions-rs/cargo@v1
+      with:
+        command: build
+        args: --locked --release --no-default-features
+    - name: Run cargo test
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: --locked --release
+
+  test-others:
+    name: Tests on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-12, windows-2022]
+    steps:
+    - uses: actions/checkout@v3
+    - name: Cache dependencies
+      uses: Swatinem/rust-cache@v2.2.0
+    - name: Run cargo check without any default features
+      uses: actions-rs/cargo@v1
+      with:
+        command: build
+        args: --locked --release --no-default-features
+    - name: Run cargo test
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: --locked --release
+
+  # We run tests in debug also, to make sure that the debug_assertions are hit
+  test-debug:
+    name: Run tests in debug
+    runs-on: ubuntu-latest
+    container:
+      # Use ubuntu-18.04 to compile with glibc 2.27, which are the production expectations
+      image: ubuntu:18.04
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install needed dependencies
+        run: |
+          apt-get update && apt-get install -y curl
+          apt-get install build-essential -y
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
+      - name: Cache dependencies
+        uses: Swatinem/rust-cache@v2.2.0
+      - name: Run tests in debug
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --locked
+
+  clippy:
+    name: Run Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: clippy
+      - name: Cache dependencies
+        uses: Swatinem/rust-cache@v2.2.0
+      - name: Run cargo clippy
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --all-targets -- --deny warnings --allow clippy::uninlined_format_args
+
+  fmt:
+    name: Run Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          override: true
+          components: rustfmt
+      - name: Cache dependencies
+        uses: Swatinem/rust-cache@v2.2.0
+      - name: Run cargo fmt
+        run: cargo fmt --all -- --check

.github/workflows/update-cargo-toml-version.yml

@@ -0,0 +1,48 @@
+name: Update Meilisearch version in all Cargo.toml files
+
+on:
+  workflow_dispatch:
+    inputs:
+      new_version:
+        description: 'The new version (vX.Y.Z)'
+        required: true
+
+env:
+  NEW_VERSION: ${{ github.event.inputs.new_version }}
+  NEW_BRANCH: update-version-${{ github.event.inputs.new_version }}
+  GH_TOKEN: ${{ secrets.MEILI_BOT_GH_PAT }}
+
+jobs:
+
+  update-version-cargo-toml:
+    name: Update version in Cargo.toml files
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - name: Install sd
+        run: cargo install sd
+      - name: Update Cargo.toml files
+        run: |
+          raw_new_version=$(echo $NEW_VERSION | cut -d 'v' -f 2)
+          new_string="version = \"$raw_new_version\""
+          sd '^version = "\d+.\d+.\w+"$' "$new_string" */Cargo.toml
+      - name: Build Meilisearch to update Cargo.lock
+        run: cargo build
+      - name: Commit and push the changes to the ${{ env.NEW_BRANCH }} branch
+        uses: EndBug/add-and-commit@v9
+        with:
+          message: "Update version for the next release (${{ env.NEW_VERSION }}) in Cargo.toml files"
+          new_branch: ${{ env.NEW_BRANCH }}
+      - name: Create the PR pointing to ${{ github.ref_name }}
+        run: |
+          gh pr create \
+            --title "Update version for the next release ($NEW_VERSION) in Cargo.toml files" \
+            --body '⚠️ This PR is automatically generated. Check the new version is the expected one before merging.' \
+            --label 'skip changelog' \
+            --milestone $NEW_VERSION \
+            --base $GITHUB_REF_NAME

.gitignore

@@ -1,7 +1,16 @@
-/rocksdb
 /target
-/Cargo.lock
-**/*.rs.bk
 **/*.csv
 **/*.json_lines
-**/*.rdb
+**/*.rs.bk
+/*.mdb
+/query-history.txt
+/data.ms
+/snapshots
+/dumps
+
+
+# Snapshots
+## ... large
+*.full.snap
+##  ... unreviewed
+*.snap.new

.rustfmt.toml

@@ -0,0 +1,5 @@
+unstable_features = true
+
+use_small_heuristics = "max"
+imports_granularity = "Module"
+group_imports = "StdExternalCrate"

.travis.yml

@@ -1,22 +0,0 @@
-language: rust
-
-cache: cargo
-
-branches:
-  only:
-    - master
-
-matrix:
-  fast_finish: true
-  include:
-
-  # Test crates on their minimum Rust versions.
-  - rust: 1.31.0
-    name: "meilidb on 1.31.0"
-    script: ./ci/meilidb.sh
-
-  # Test crates on nightly Rust.
-  - rust: nightly
-    name: "meilidb on nightly"
-    script: ./ci/meilidb.sh
-

CODE_OF_CONDUCT.md

@@ -0,0 +1,76 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+ advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+ address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+ professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at bonjour@meilisearch.com. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

CONTRIBUTING.md

@@ -0,0 +1,114 @@
+# Contributing
+
+First, thank you for contributing to Meilisearch! The goal of this document is to provide everything you need to start contributing to Meilisearch.
+
+Remember that there are many ways to contribute other than writing code: writing [tutorials or blog posts](https://github.com/meilisearch/awesome-meilisearch), improving [the documentation](https://github.com/meilisearch/documentation), submitting [bug reports](https://github.com/meilisearch/meilisearch/issues/new?assignees=&labels=&template=bug_report.md&title=) and [feature requests](https://github.com/meilisearch/product/discussions/categories/feedback-feature-proposal)...
+
+The code in this repository is only concerned with managing multiple indexes, handling the update store, and exposing an HTTP API. Search and indexation are the domain of our core engine, [`milli`](https://github.com/meilisearch/milli), while tokenization is handled by [our `charabia` library](https://github.com/meilisearch/charabia/).
+
+If Meilisearch does not offer optimized support for your language, please consider contributing to `charabia` by following the [CONTRIBUTING.md file](https://github.com/meilisearch/charabia/blob/main/CONTRIBUTING.md) and integrating your intended normalizer/segmenter.
+
+## Table of Contents
+
+- [Assumptions](#assumptions)
+- [How to Contribute](#how-to-contribute)
+- [Development Workflow](#development-workflow)
+- [Git Guidelines](#git-guidelines)
+- [Release Process (for internal team only)](#release-process-for-internal-team-only)
+
+## Assumptions
+
+1. **You're familiar with [GitHub](https://github.com) and the [Pull Requests](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/about-pull-requests)(PR) workflow.**
+2. **You've read the Meilisearch [documentation](https://docs.meilisearch.com).**
+3. **You know about the [Meilisearch community](https://docs.meilisearch.com/learn/what_is_meilisearch/contact.html).
+   Please use this for help.**
+
+## How to Contribute
+
+1. Ensure your change has an issue! Find an
+   [existing issue](https://github.com/meilisearch/meilisearch/issues/) or [open a new issue](https://github.com/meilisearch/meilisearch/issues/new).
+   * This is where you can get a feel if the change will be accepted or not.
+2. Once approved, [fork the Meilisearch repository](https://help.github.com/en/github/getting-started-with-github/fork-a-repo) in your own GitHub account.
+3. [Create a new Git branch](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/creating-and-deleting-branches-within-your-repository)
+4. Review the [Development Workflow](#development-workflow) section that describes the steps to maintain the repository.
+5. Make your changes on your branch.
+6. [Submit the branch as a Pull Request](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/creating-a-pull-request-from-a-fork) pointing to the `main` branch of the Meilisearch repository. A maintainer should comment and/or review your Pull Request within a few days. Although depending on the circumstances, it may take longer.
+
+## Development Workflow
+
+### Setup and run Meilisearch
+
+```bash
+cargo run --release
+```
+
+We recommend using the `--release` flag to test the full performance of Meilisearch.
+
+### Test
+
+```bash
+cargo test
+```
+
+This command will be triggered to each PR as a requirement for merging it.
+
+If you get a "Too many open files" error you might want to increase the open file limit using this command:
+
+```bash
+ulimit -Sn 3000
+```
+
+## Git Guidelines
+
+### Git Branches
+
+All changes must be made in a branch and submitted as PR.
+
+We do not enforce any branch naming style, but please use something descriptive of your changes.
+
+### Git Commits
+
+As minimal requirements, your commit message should:
+- be capitalized
+- not finish by a dot or any other punctuation character (!,?)
+- start with a verb so that we can read your commit message this way: "This commit will ...", where "..." is the commit message.
+  e.g.: "Fix the home page button" or "Add more tests for create_index method"
+
+We don't follow any other convention, but if you want to use one, we recommend [the Chris Beams one](https://chris.beams.io/posts/git-commit/).
+
+### GitHub Pull Requests
+
+Some notes on GitHub PRs:
+
+- All PRs must be reviewed and approved by at least one maintainer.
+- The PR title should be accurate and descriptive of the changes.
+- [Convert your PR as a draft](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/changing-the-stage-of-a-pull-request) if your changes are a work in progress: no one will review it until you pass your PR as ready for review.<br>
+  The draft PRs are recommended when you want to show that you are working on something and make your work visible.
+- The branch related to the PR must be **up-to-date with `main`** before merging. Fortunately, this project uses [Bors](https://github.com/bors-ng/bors-ng) to automatically enforce this requirement without the PR author having to rebase manually.
+
+## Release Process (for internal team only)
+
+Meilisearch tools follow the [Semantic Versioning Convention](https://semver.org/).
+
+### Automation to rebase and Merge the PRs
+
+This project integrates a bot that helps us manage pull requests merging.<br>
+_[Read more about this](https://github.com/meilisearch/integration-guides/blob/main/resources/bors.md)._
+
+### How to Publish a new Release
+
+The full Meilisearch release process is described in [this guide](https://github.com/meilisearch/engine-team/blob/main/resources/meilisearch-release.md). Please follow it carefully before doing any release.
+
+### Release assets
+
+For each release, the following assets are created:
+- Binaries for different platforms (Linux, MacOS, Windows and ARM architectures) are attached to the GitHub release
+- Binaries are pushed to HomeBrew and APT (not published for RC)
+- Docker tags are created/updated:
+  - `vX.Y.Z`
+  - `vX.Y` (not published for RC)
+  - `latest` (not published for RC)
+
+<hr>
+
+Thank you again for reading this through, we can not wait to begin to work with you if you made your way through this contributing guide ❤️

Cargo.toml

@@ -1,61 +1,21 @@
-[package]
-edition = "2018"
-name = "meilidb"
-version = "0.2.1"
-authors = ["Kerollmops <renault.cle@gmail.com>"]
-
-[dependencies]
-bincode = "1.0"
-byteorder = "1.2"
-crossbeam = "0.6"
-elapsed = "0.1"
-fst = "0.3"
-hashbrown = { version = "0.1", features = ["serde"] }
-lazy_static = "1.1"
-levenshtein_automata = { version = "0.1", features = ["fst_automaton"] }
-linked-hash-map = { version = "0.5", features = ["serde_impl"] }
-log = "0.4"
-sdset = "0.3"
-serde = "1.0"
-serde_derive = "1.0"
-serde_json = { version = "1.0", features = ["preserve_order"] }
-unidecode = "0.3"
-
-[dependencies.toml]
-git = "https://github.com/Kerollmops/toml-rs.git"
-features = ["preserve_order"]
-rev = "0372ba6"
-
-[dependencies.rocksdb]
-git = "https://github.com/pingcap/rust-rocksdb.git"
-rev = "306e201"
-
-[dependencies.group-by]
-git = "https://github.com/Kerollmops/group-by.git"
-rev = "5a113fe"
-
-[features]
-default = ["simd"]
-i128 = ["bincode/i128", "byteorder/i128"]
-portable = ["rocksdb/portable"]
-simd = ["rocksdb/sse"]
-nightly = ["hashbrown/nightly", "group-by/nightly"]
-
-[dev-dependencies]
-csv = "1.0"
-env_logger = "0.6"
-jemallocator = "0.1"
-quickcheck = "0.8"
-rand = "0.6"
-rand_xorshift = "0.1"
-structopt = "0.2"
-tempfile = "3.0"
-termcolor = "1.0"
-warp = "0.1"
-
-[dev-dependencies.chashmap]
-git = "https://gitlab.redox-os.org/redox-os/tfs.git"
-rev = "b3e7cae1"
+[workspace]
+resolver = "2"
+members = [
+    "meilisearch",
+    "meilisearch-types",
+    "meilisearch-auth",
+    "meili-snap",
+    "index-scheduler",
+    "dump",
+    "file-store",
+    "permissive-json-pointer",
+]
 
 [profile.release]
-debug = true
+codegen-units = 1
+
+[profile.dev.package.flate2]
+opt-level = 3
+
+[profile.dev.package.milli]
+opt-level = 3

Cross.toml

@@ -0,0 +1,7 @@
+[build.env]
+passthrough = [
+    "RUST_BACKTRACE",
+    "CARGO_TERM_COLOR",
+    "RUSTFLAGS",
+    "JEMALLOC_SYS_WITH_LG_PAGE"
+]

Dockerfile

@@ -0,0 +1,46 @@
+# Compile
+FROM    rust:alpine3.16 AS compiler
+
+RUN     apk add -q --update-cache --no-cache build-base openssl-dev
+
+WORKDIR /meilisearch
+
+ARG     COMMIT_SHA
+ARG     COMMIT_DATE
+ENV     VERGEN_GIT_SHA=${COMMIT_SHA} VERGEN_GIT_COMMIT_TIMESTAMP=${COMMIT_DATE}
+ENV     RUSTFLAGS="-C target-feature=-crt-static"
+
+COPY    . .
+RUN     set -eux; \
+        apkArch="$(apk --print-arch)"; \
+        if [ "$apkArch" = "aarch64" ]; then \
+            export JEMALLOC_SYS_WITH_LG_PAGE=16; \
+        fi && \
+        cargo build --release
+
+# Run
+FROM    alpine:3.16
+
+ENV     MEILI_HTTP_ADDR 0.0.0.0:7700
+ENV     MEILI_SERVER_PROVIDER docker
+
+RUN     apk update --quiet \
+        && apk add -q --no-cache libgcc tini curl
+
+# add meilisearch to the `/bin` so you can run it from anywhere and it's easy
+# to find.
+COPY    --from=compiler /meilisearch/target/release/meilisearch /bin/meilisearch
+# To stay compatible with the older version of the container (pre v0.27.0) we're
+# going to symlink the meilisearch binary in the path to `/meilisearch`
+RUN     ln -s /bin/meilisearch /meilisearch
+
+# This directory should hold all the data related to meilisearch so we're going
+# to move our PWD in there.
+# We don't want to put the meilisearch binary
+WORKDIR /meili_data
+
+
+EXPOSE  7700/tcp
+
+ENTRYPOINT ["tini", "--"]
+CMD     /bin/meilisearch

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018 Clément Renault
+Copyright (c) 2019-2022 Meili SAS
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,60 +1,103 @@
-# MeiliDB
+<p align="center">
+  <img src="assets/meilisearch-logo-light.svg?sanitize=true#gh-light-mode-only">
+  <img src="assets/meilisearch-logo-dark.svg?sanitize=true#gh-dark-mode-only">
+</p>
 
-[![Build Status](https://travis-ci.org/Kerollmops/MeiliDB.svg?branch=master)](https://travis-ci.org/Kerollmops/MeiliDB)
-[![dependency status](https://deps.rs/repo/github/Kerollmops/MeiliDB/status.svg)](https://deps.rs/repo/github/Kerollmops/MeiliDB)
-[![License](https://img.shields.io/github/license/Kerollmops/MeiliDB.svg)](https://github.com/Kerollmops/MeiliDB)
-[![Rust 1.31+](https://img.shields.io/badge/rust-1.31+-lightgray.svg)](
-https://www.rust-lang.org)
+<h4 align="center">
+  <a href="https://www.meilisearch.com">Website</a> |
+  <a href="https://roadmap.meilisearch.com/tabs/1-under-consideration">Roadmap</a> |
+  <a href="https://blog.meilisearch.com">Blog</a> |
+  <a href="https://docs.meilisearch.com">Documentation</a> |
+  <a href="https://docs.meilisearch.com/faq/">FAQ</a> |
+  <a href="https://discord.meilisearch.com">Discord</a>
+</h4>
 
-A _full-text search database_ using a key-value store internally.
+<p align="center">
+  <a href="https://github.com/meilisearch/meilisearch/actions"><img src="https://github.com/meilisearch/meilisearch/workflows/Cargo%20test/badge.svg" alt="Build Status"></a>
+  <a href="https://deps.rs/repo/github/meilisearch/meilisearch"><img src="https://deps.rs/repo/github/meilisearch/meilisearch/status.svg" alt="Dependency status"></a>
+  <a href="https://github.com/meilisearch/meilisearch/blob/main/LICENSE"><img src="https://img.shields.io/badge/license-MIT-informational" alt="License"></a>
+  <a href="https://app.bors.tech/repositories/26457"><img src="https://bors.tech/images/badge_small.svg" alt="Bors enabled"></a>
+</p>
 
-It uses [RocksDB](https://github.com/facebook/rocksdb) as the internal key-value store. The key-value store allows us to handle updates and queries with small memory and CPU overheads.
+<p align="center">⚡ A lightning-fast search engine that fits effortlessly into your apps, websites, and workflow 🔍</p>
 
-You can [read the deep dive](deep-dive.md) if you want more information on the engine, it describes the whole process of generating updates and handling queries.
+Meilisearch helps you shape a delightful search experience in a snap, offering features that work out-of-the-box to speed up your workflow.
 
-We will be proud if you submit issues and pull requests. You can help to grow this project and start contributing by checking [issues tagged "good-first-issue"](https://github.com/Kerollmops/MeiliDB/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22). It is a good start!
+<p align="center" name="demo">
+  <a href="https://where2watch.meilisearch.com/#gh-light-mode-only" target="_blank">
+    <img src="assets/demo-light.gif#gh-light-mode-only" alt="A bright colored application for finding movies screening near the user">
+  </a>
+  <a href="https://where2watch.meilisearch.com/#gh-dark-mode-only" target="_blank">
+    <img src="assets/demo-dark.gif#gh-dark-mode-only" alt="A dark colored application for finding movies screening near the user">
+  </a>
+</p>
 
-The project is only a library yet. It means that there is no binary provided yet. To get started, you can check the examples wich are made to work with the data located in the `misc/` folder.
+🔥 [**Try it!**](https://where2watch.meilisearch.com/) 🔥
 
-MeiliDB will be a binary in a near future so you will be able to use it as a database out-of-the-box. We should be able to query it using a [to-be-defined](https://github.com/Kerollmops/MeiliDB/issues/38) protocol. This is our current goal, [see the milestones](https://github.com/Kerollmops/MeiliDB/milestones). In the end, the binary will be a bunch of network protocols and wrappers around the library - which will also be published on [crates.io](https://crates.io). Both the binary and the library will follow the same update cycle.
+## ✨ Features
 
+- **Search-as-you-type:** find search results in less than 50 milliseconds
+- **[Typo tolerance](https://docs.meilisearch.com/learn/getting_started/customizing_relevancy.html#typo-tolerance):** get relevant matches even when queries contain typos and misspellings
+- **[Filtering and faceted search](https://docs.meilisearch.com/learn/advanced/filtering_and_faceted_search.html):** enhance your user's search experience with custom filters and build a faceted search interface in a few lines of code
+- **[Sorting](https://docs.meilisearch.com/learn/advanced/sorting.html):** sort results based on price, date, or pretty much anything else your users need
+- **[Synonym support](https://docs.meilisearch.com/learn/getting_started/customizing_relevancy.html#synonyms):** configure synonyms to include more relevant content in your search results
+- **[Geosearch](https://docs.meilisearch.com/learn/advanced/geosearch.html):** filter and sort documents based on geographic data
+- **[Extensive language support](https://docs.meilisearch.com/learn/what_is_meilisearch/language.html):** search datasets in any language, with optimized support for Chinese, Japanese, Hebrew, and languages using the Latin alphabet
+- **[Security management](https://docs.meilisearch.com/learn/security/master_api_keys.html):** control which users can access what data with API keys that allow fine-grained permissions handling
+- **[Multi-Tenancy](https://docs.meilisearch.com/learn/security/tenant_tokens.html):** personalize search results for any number of application tenants
+- **Highly Customizable:** customize Meilisearch to your specific needs or use our out-of-the-box and hassle-free presets
+- **[RESTful API](https://docs.meilisearch.com/reference/api/overview.html):** integrate Meilisearch in your technical stack with our plugins and SDKs
+- **Easy to install, deploy, and maintain**
 
+## 📖 Documentation
 
-## Performances
+You can consult Meilisearch's documentation at [https://docs.meilisearch.com](https://docs.meilisearch.com/).
 
-With a database composed of _100 353_ documents with _352_ attributes each and _90_ of them indexed.
-So nearly _9 million_ fields indexed for _35 million_ stored we can handle more than _1.2k req/sec_ on an Intel i7-7700 (8) @ 4.2GHz.
+## 🚀 Getting started
 
-Requests are made using [wrk](https://github.com/wg/wrk) and scripted to generate real users queries.
+For basic instructions on how to set up Meilisearch, add documents to an index, and search for documents, take a look at our [Quick Start](https://docs.meilisearch.com/learn/getting_started/quick_start.html) guide.
 
-```
-Running 10s test @ http://localhost:2230
-  2 threads and 12 connections
-  Thread Stats   Avg      Stdev     Max   +/- Stdev
-    Latency    18.86ms   49.39ms 614.89ms   95.23%
-    Req/Sec   620.41     59.53   790.00     65.00%
-  12359 requests in 10.00s, 3.26MB read
-Requests/sec:   1235.54
-Transfer/sec:    334.22KB
-```
+You may also want to check out [Meilisearch 101](https://docs.meilisearch.com/learn/getting_started/filtering_and_sorting.html) for an introduction to some of Meilisearch's most popular features.
 
-### Notes
+## ☁️ Meilisearch cloud
 
-The default Rust allocator has recently been [changed to use the system allocator](https://github.com/rust-lang/rust/pull/51241/).
-We have seen much better performances when [using jemalloc as the global allocator](https://github.com/alexcrichton/jemallocator#documentation).
+Let us manage your infrastructure so you can focus on integrating a great search experience. Try [Meilisearch Cloud](https://meilisearch.com/pricing) today.
 
-## Usage and examples
+## 🧰 SDKs & integration tools
 
-MeiliDB runs with an index like most search engines.
-So to test the library you can create one by indexing a simple csv file.
+Install one of our SDKs in your project for seamless integration between Meilisearch and your favorite language or framework!
 
-```bash
-cargo run --release --example create-database -- test.mdb misc/kaggle.csv --schema schema-example.toml
-```
+Take a look at the complete [Meilisearch integration list](https://docs.meilisearch.com/learn/what_is_meilisearch/sdks.html).
 
-Once the command is executed, the index should be in the `test.mdb` folder. You are now able to run the `query-database` example and play with MeiliDB.
+![Logos belonging to different languages and frameworks supported by Meilisearch, including React, Ruby on Rails, Go, Rust, and PHP](assets/integrations.png)
 
-```bash
-cargo run --release --example query-database -- test.mdb -n 10 id title
-```
+## ⚙️ Advanced usage
 
+Experienced users will want to keep our [API Reference](https://docs.meilisearch.com/reference/api) close at hand.
+
+We also offer a wide range of dedicated guides to all Meilisearch features, such as [filtering](https://docs.meilisearch.com/learn/advanced/filtering_and_faceted_search.html), [sorting](https://docs.meilisearch.com/learn/advanced/sorting.html), [geosearch](https://docs.meilisearch.com/learn/advanced/geosearch.html), [API keys](https://docs.meilisearch.com/learn/security/master_api_keys.html), and [tenant tokens](https://docs.meilisearch.com/learn/security/tenant_tokens.html).
+
+Finally, for more in-depth information, refer to our articles explaining fundamental Meilisearch concepts such as [documents](https://docs.meilisearch.com/learn/core_concepts/documents.html) and [indexes](https://docs.meilisearch.com/learn/core_concepts/indexes.html).
+
+## 📊 Telemetry
+
+Meilisearch collects **anonymized** data from users to help us improve our product. You can [deactivate this](https://docs.meilisearch.com/learn/what_is_meilisearch/telemetry.html#how-to-disable-data-collection) whenever you want.
+
+To request deletion of collected data, please write to us at [privacy@meilisearch.com](mailto:privacy@meilisearch.com). Don't forget to include your `Instance UID` in the message, as this helps us quickly find and delete your data.
+
+If you want to know more about the kind of data we collect and what we use it for, check the [telemetry section](https://docs.meilisearch.com/learn/what_is_meilisearch/telemetry.html) of our documentation.
+
+## 📫 Get in touch!
+
+Meilisearch is a search engine created by [Meili](https://www.welcometothejungle.com/en/companies/meilisearch), a software development company based in France and with team members all over the world. Want to know more about us? [Check out our blog!](https://blog.meilisearch.com/)
+
+🗞 [Subscribe to our newsletter](https://meilisearch.us2.list-manage.com/subscribe?u=27870f7b71c908a8b359599fb&id=79582d828e) if you don't want to miss any updates! We promise we won't clutter your mailbox: we only send one edition every two months.
+
+💌 Want to make a suggestion or give feedback? Here are some of the channels where you can reach us:
+
+- For feature requests, please visit our [product repository](https://github.com/meilisearch/product/discussions)
+- Found a bug? Open an [issue](https://github.com/meilisearch/meilisearch/issues)!
+- Want to be part of our Discord community? [Join us!](https://discord.gg/meilisearch)
+- For everything else, please check [this page listing some of the other places where you can find us](https://docs.meilisearch.com/learn/what_is_meilisearch/contact.html)
+
+Thank you for your support!

SECURITY.md

@@ -0,0 +1,33 @@
+# Security
+
+Meilisearch takes the security of our software products and services seriously.
+
+If you believe you have found a security vulnerability in any Meilisearch-owned repository, please report it to us as described below.
+
+## Supported versions
+
+As long as we are pre-v1.0, only the latest version of Meilisearch will be supported with security updates.
+
+## Reporting security issues
+
+⚠️ Please do not report security vulnerabilities through public GitHub issues. ⚠️
+
+Instead, please kindly email us at security@meilisearch.com
+
+Please include the requested information listed below (as much as you can provide) to help us better understand the nature and scope of the possible issue:
+
+- Type of issue (e.g. buffer overflow, SQL injection, cross-site scripting, etc.)
+- Full paths of source file(s) related to the manifestation of the issue
+- The location of the affected source code (tag/branch/commit or direct URL)
+- Any special configuration required to reproduce the issue
+- Step-by-step instructions to reproduce the issue
+- Proof-of-concept or exploit code (if possible)
+- Impact of the issue, including how an attacker might exploit the issue
+
+This information will help us triage your report more quickly.
+
+You will receive a response from us within 72 hours. If the issue is confirmed, we will release a patch as soon as possible depending on complexity.
+
+## Preferred languages
+
+We prefer all communications to be in English.

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assets/meilisearch-logo-light.svg

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bors.toml

@@ -0,0 +1,11 @@
+status = [
+    'Tests on ubuntu-18.04',
+    'Tests on macos-12',
+    'Tests on windows-2022',
+    'Run Clippy',
+    'Run Rustfmt',
+    'Run tests in debug',
+]
+pr_status = ['Milestone Check']
+# 3 hours timeout
+timeout-sec = 10800

ci/meilidb.sh

@@ -1,15 +0,0 @@
-#!/bin/bash
-
-cd "$(dirname "$0")"/..
-set -ex
-
-export RUSTFLAGS="-D warnings"
-
-cargo check --no-default-features
-cargo check --bins --examples --tests
-cargo test
-
-if [[ "$TRAVIS_RUST_VERSION" == "nightly" ]]; then
-    cargo check --no-default-features --features nightly
-    cargo test --features nightly
-fi

config.toml

@@ -0,0 +1,120 @@
+# This file shows the default configuration of Meilisearch.
+# All variables are defined here: https://docs.meilisearch.com/learn/configuration/instance_options.html#environment-variables
+
+db_path = "./data.ms"
+# Designates the location where database files will be created and retrieved.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#database-path
+
+env = "development"
+# Configures the instance's environment. Value must be either `production` or `development`.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#environment
+
+http_addr = "localhost:7700"
+# The address on which the HTTP server will listen.
+
+# master_key = "YOUR_MASTER_KEY_VALUE"
+# Sets the instance's master key, automatically protecting all routes except GET /health.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#master-key
+
+# no_analytics = true
+# Deactivates Meilisearch's built-in telemetry when provided.
+# Meilisearch automatically collects data from all instances that do not opt out using this flag.
+# All gathered data is used solely for the purpose of improving Meilisearch, and can be deleted at any time.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#disable-analytics
+
+http_payload_size_limit = "100 MB"
+# Sets the maximum size of accepted payloads.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#payload-limit-size
+
+log_level = "INFO"
+# Defines how much detail should be present in Meilisearch's logs.
+# Meilisearch currently supports six log levels, listed in order of increasing verbosity:  `OFF`, `ERROR`, `WARN`, `INFO`, `DEBUG`, `TRACE`
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#log-level
+
+# max_indexing_memory = "2 GiB"
+# Sets the maximum amount of RAM Meilisearch can use when indexing.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#max-indexing-memory
+
+# max_indexing_threads = 4
+# Sets the maximum number of threads Meilisearch can use during indexing.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#max-indexing-threads
+
+#############
+### DUMPS ###
+#############
+
+dump_dir = "dumps/"
+# Sets the directory where Meilisearch will create dump files.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#dumps-destination
+
+# import_dump = "./path/to/my/file.dump"
+# Imports the dump file located at the specified path. Path must point to a .dump file.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#import-dump
+
+ignore_missing_dump = false
+# Prevents Meilisearch from throwing an error when `import_dump` does not point to a valid dump file.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ignore-missing-dump
+
+ignore_dump_if_db_exists = false
+# Prevents a Meilisearch instance with an existing database from throwing an error when using `import_dump`.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ignore-dump-if-db-exists
+
+
+#################
+### SNAPSHOTS ###
+#################
+
+schedule_snapshot = false
+# Enables scheduled snapshots when true, disable when false (the default).
+# If the value is given as an integer, then enables the scheduled snapshot with the passed value as the interval
+# between each snapshot, in seconds.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#schedule-snapshot-creation
+
+snapshot_dir = "snapshots/"
+# Sets the directory where Meilisearch will store snapshots.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#snapshot-destination
+
+# import_snapshot = "./path/to/my/snapshot"
+# Launches Meilisearch after importing a previously-generated snapshot at the given filepath.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#import-snapshot
+
+ignore_missing_snapshot = false
+# Prevents a Meilisearch instance from throwing an error when `import_snapshot` does not point to a valid snapshot file.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ignore-missing-snapshot
+
+ignore_snapshot_if_db_exists = false
+# Prevents a Meilisearch instance with an existing database from throwing an error when using `import_snapshot`.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ignore-snapshot-if-db-exists
+
+
+###########
+### SSL ###
+###########
+
+# ssl_auth_path = "./path/to/root"
+# Enables client authentication in the specified path.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ssl-authentication-path
+
+# ssl_cert_path = "./path/to/certfile"
+# Sets the server's SSL certificates.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ssl-certificates-path
+
+# ssl_key_path = "./path/to/private-key"
+# Sets the server's SSL key files.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ssl-key-path
+
+# ssl_ocsp_path = "./path/to/ocsp-file"
+# Sets the server's OCSP file.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ssl-ocsp-path
+
+ssl_require_auth = false
+# Makes SSL authentication mandatory.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ssl-require-auth
+
+ssl_resumption = false
+# Activates SSL session resumption.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ssl-resumption
+
+ssl_tickets = false
+# Activates SSL tickets.
+# https://docs.meilisearch.com/learn/configuration/instance_options.html#ssl-tickets

deep-dive.md

@@ -1,140 +0,0 @@
-# A deep dive in MeiliDB
-
-On the 9 of december 2018.
-
-MeiliDB is a full text search engine based on a final state transducer named [fst](https://github.com/BurntSushi/fst) and a key-value store named [RocksDB](https://github.com/facebook/rocksdb). The goal of a search engine is to store data and to respond to queries as accurate and fast as possible. To achieve this it must save the data as an [inverted index](https://en.wikipedia.org/wiki/Inverted_index).
-
-
-
-<!-- MarkdownTOC autolink="true" -->
-
-- [Where is the data stored?](#where-is-the-data-stored)
-- [What does the key-value store contains?](#what-does-the-key-value-store-contains)
-    - [The blob type](#the-blob-type)
-        - [A final state transducer](#a-final-state-transducer)
-        - [Document indexes](#document-indexes)
-        - [Document ids](#document-ids)
-    - [The schema](#the-schema)
-    - [Document attributes](#document-attributes)
-- [How is an update handled?](#how-is-an-update-handled)
-    - [The merge operation is CPU consuming](#the-merge-operation-is-cpu-consuming)
-- [How is a request processed?](#how-is-a-request-processed)
-    - [Query lexemes](#query-lexemes)
-    - [Automatons and query index](#automatons-and-query-index)
-    - [Sort by criteria](#sort-by-criteria)
-    - [Retrieve original documents](#retrieve-original-documents)
-
-<!-- /MarkdownTOC -->
-
-## Where is the data stored?
-
-MeiliDB is entirely backed by a key-value store like any good database (i.e. Postgres, MySQL). This brings a great flexibility in the way documents can be stored and updates handled along time.
-
-[RocksDB brings some](https://rocksdb.org/blog/2015/02/27/write-batch-with-index.html) of the [A.C.I.D. properties](https://en.wikipedia.org/wiki/ACID_(computer_science)) to help us be sure the saved data is consistent, for example we use SST files and the key-value store ability to load them in one time to manage updates.
-
-Note that the SST file have the same restriction as the fst, it needs its keys to be added in order at creation.
-
-
-
-## What does the key-value store contains?
-
-It contain the blob, the schema and the documents stored attributes.
-
-### The blob type
-
-[The Blob type](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/database/blob/mod.rs#L16-L19) is a data structure that indicate if an update is a positive or a negative one. In the case where the update is considered positive, the blob will contain [an fst map and the document indexes](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/database/blob/positive/blob.rs#L15-L18) associated. In the other case it will only contain [all the document ids](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/database/blob/negative/blob.rs#L12-L14) that must be considered removed.
-
-The Blob type [is stored under the "*data-index*" entry](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/database/update/positive/update.rs#L497-L499) and marked as [a merge operation](https://github.com/facebook/rocksdb/wiki/Merge-Operator-Implementation) in the key-value store.
-
-#### A final state transducer
-
-_...also abbreviated fst_
-
-This is the first entry point of the engine, you can read more about how it work with the beautiful blog post of @BurntSushi, [Index 1,600,000,000 Keys with Automata and Rust](https://blog.burntsushi.net/transducers/).
-
-To make it short it is a powerful way to store all the words that are present in the indexed documents. You construct it by giving it all the words you want to index associated with a value that, for the moment, can only be an `u64`. When you want to search in it you can provide any automaton you want, in MeiliDB [a custom levenshtein automaton](https://github.com/tantivy-search/levenshtein-automata/) is used.
-
-Note that the number under each word is auto-incremental, each new word have a new number that is greater than the prevous one.
-
-Another powerful feature of `fst` is that it can nearly avoid using RAM and be streamed to disk for example, the problem is that the keys must be always added in lexicographic order, so you must sort them before, for the moment MeiliDB uses a [BTreeMap](https://github.com/Kerollmops/raptor-rs/blob/8abdb0a228e2808fe1814a6a0641a4b72d158579/src/metadata/doc_indexes.rs#L107-L112).
-
-#### Document indexes
-
-As it has been specified, the `fst` can only store a number corresponding to a word, an `u64`, but the goal of the search engine is to retrieve a match in a document when a query is made. You want it to return some sort of position in an attribute in a document, an information about where the given word match.
-
-To make it possible, a custom data structure has been developed, the document indexes is composed of two arrays, the ranges array and all the docindexes corresponding to a given range, each range identify the word number. The [DocIndexes](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/data/doc_indexes.rs#L23) type is designed to be streamed when constructed, consumming a minimum amount of ram like the fst. Another advantage is that the slices are accessible in `O(1)` when you know the word associated number.
-
-#### Document ids
-
-This is a simple ordered list of all documents ids which must be considered deleted. It is used with [the sdset library](https://docs.rs/sdset/0.3.0/sdset/duo/struct.DifferenceByKey.html), the docindexes and the `DifferenceByKey` operation builder when merging blobs.
-
-When a blob represent a negative update it only contains this simple slice of deleted documents ids.
-
-### The schema
-
-The schema is a data struture that represents which documents attributes should be stored and which should be indexed. It is stored under the "_data-schema_" entry and given to MeiliDB only at the creation.
-
-Each document attribute is associated to a unique 32 bit number named `SchemaAttr`.
-
-In the future this schema type could be given along with updates and probably be different from the original, the database could be able to handled this document structure and reindex it.
-
-### Document attributes
-
-When the engine handle a query the result that the requester want is a document, not only the [match](https://github.com/Kerollmops/MeiliDB/blob/fc2cdf92596fc002ce278e3aa8718640ac44724d/src/lib.rs#L51-L79) associated to it, fields of the original document must be returned too.
-
-So MeiliDB again uses the power of the underlying key-value store and save the documents attributes marked as _STORE_. The key is prefixed by "_doc_" followed by the 64 bit document id in bytes and the schema attribute number in bytes corresponding to the document attribute stored.
-
-When a document field is saved in the key-value store its value is binary encoded using the [bincode](https://docs.rs/bincode/) library, so a document must be serializable using serde.
-
-
-
-## How is an update handled?
-
-First of all an update in MeiliDB is nothing more than [a RocksDB SST file](https://github.com/facebook/rocksdb/wiki/Creating-and-Ingesting-SST-files). It contains the blob and all the documents attributes binary encoded like described above. Note that the blob is stored under the "_data-index_" key marked as [a merge operation](https://github.com/facebook/rocksdb/wiki/Merge-Operator-Implementation).
-
-### The merge operation is CPU consuming
-
-When [the database ingest an update](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/database/mod.rs#L108-L145) it gives the SST file to the underlying RocksDB, once it has ingested it there is a "_data-index_" entry available, we can request it but the key-value store will call a function before, a merge operation is performed.
-
-This merge operation is done on multiple blobs as you have understood and will compute a [PositiveBlob](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/database/blob/positive/blob.rs#L15), this type contains the fst and document indexes structures allowing us to search for documents. This two data structures can be considered as the inverted index.
-
-The computation time of this merge is important, RocksDB doesn't keep the previous merged result, it will call our merge operation each time until it decided to do a compaction. So [we must force this compaction earlier](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/database/mod.rs#L129-L131) when we receive an update to reduce this cost.
-
-This way when we request the "_data-index_" value it will gives us the previously merged positive blob without any other merge overhead.
-
-
-
-## How is a request processed?
-
-Now that we have our "_data-index_" we are able to return results based on a query. In the MeiliDB universe a query is a string.
-
-### Query lexemes
-
-The first step to be able to call the underlying structures is to split the query in words, for that we use a [custom tokenizer](https://github.com/Kerollmops/MeiliDB/blob/fc2cdf92596fc002ce278e3aa8718640ac44724d/src/tokenizer/mod.rs) that is not finished for the moment, [there is an open issue](https://github.com/Kerollmops/MeiliDB/issues/3). Note that a tokenizer is specialized for a human language, this is the hard part.
-
-### Automatons and query index
-
-So to query the fst we need an automaton, in MeiliDB we use a [levenshtein automaton](https://en.wikipedia.org/wiki/Levenshtein_automaton), this automaton is constructed using a string and a maximum distance. According to the [Algolia's blog post](https://blog.algolia.com/inside-the-algolia-engine-part-3-query-processing/#algolia%e2%80%99s-way-of-searching-for-alternatives) we [created the DFAs](https://github.com/Kerollmops/MeiliDB/blob/fc2cdf92596fc002ce278e3aa8718640ac44724d/src/automaton.rs#L62-L75) with different settings.
-
-Thanks to the power of the fst library [it is possible to union multiple automatons](https://docs.rs/fst/0.3.2/fst/map/struct.OpBuilder.html#method.union) on the same fst map, it will allow us to know which [automaton returns a word according to its index](https://github.com/Kerollmops/MeiliDB/blob/fc2cdf92596fc002ce278e3aa8718640ac44724d/src/metadata/ops.rs#L111). The `Stream` is able to return all the numbers associated to the words. We use these numbers to find the whole list of `DocIndexes` associated and do the union set operation.
-
-With all these informations it is possible [to reconstruct a list of all the DocIndexes associated](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/rank/query_builder.rs#L62-L99) with the words queried.
-
-### Sort by criteria
-
-Now that we are able to get a big list of [DocIndexes](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/lib.rs#L21-L36) it is not enough to sort them by criteria, we need more informations like the levenshtein distance or the fact that a query word match exactly the word stored in the fst. So [we stuff it a little bit](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/rank/query_builder.rs#L86-L93), and aggregate all these [Matches](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/lib.rs#L47-L74) for each document. This way it will be easy to sort a simple vector of document using a bunch of functions.
-
-With this big list of documents and associated matches [we are able to sort only the part of the slice that we want](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/rank/query_builder.rs#L108-L119) using bucket sorting. [Each criterion](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/rank/criterion/mod.rs#L75-L87) is evaluated on each subslice without copy, thanks to [GroupByMut](https://github.com/Kerollmops/group-by/blob/cab857bae01463dbd0edb99b0e0d7f3624e6c6f5/src/lib.rs#L180-L185) which, I hope [will soon be merged](https://github.com/rust-lang/rfcs/pull/2477).
-
-Note that it is possible to customize the criteria used by using the `QueryBuilder::with_criteria` constructor, this way you can implement some custom ranking based on the document attributes using the appropriate structure and the `retrieve_document` method.
-
-### Retrieve original documents
-
-The [DatabaseView](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/database/database_view.rs#L18-L24) structure that you must have created to be able to query the database have [two functions](https://github.com/Kerollmops/MeiliDB/blob/550dc1e99224e386516877450320f694947332d4/src/database/database_view.rs#L60-L76) that allows you to retrieve a full (or not) document according to the schema you specified at creation time (i.e. the _STORED_ attributes).
-
-As you can see, these functions force the created type `T` to implement [the serde Deserialize trait](https://docs.rs/serde/1.0.81/serde/trait.Deserialize.html), MeiliDB will use the `bincode::deserialise` function for each attribute to construct your type and return it to you.
-
-
-
-At this point, MeiliDB work is over 🎉
-

download-latest.sh

@@ -0,0 +1,167 @@
+#!/bin/sh
+
+# This script can optionally use a GitHub token to increase your request limit (for example, if using this script in a CI).
+# To use a GitHub token, pass it through the GITHUB_PAT environment variable.
+
+# GLOBALS
+
+# Colors
+RED='\033[31m'
+GREEN='\033[32m'
+DEFAULT='\033[0m'
+
+# Project name
+PNAME='meilisearch'
+
+# GitHub API address
+GITHUB_API='https://api.github.com/repos/meilisearch/meilisearch/releases'
+# GitHub Release address
+GITHUB_REL='https://github.com/meilisearch/meilisearch/releases/download/'
+
+# FUNCTIONS
+
+# Gets the version of the latest stable version of Meilisearch by setting the $latest variable.
+# Returns 0 in case of success, 1 otherwise.
+get_latest() {
+    # temp_file is needed because the grep would start before the download is over
+    temp_file=$(mktemp -q /tmp/$PNAME.XXXXXXXXX)
+    latest_release="$GITHUB_API/latest"
+
+    if [ $? -ne 0 ]; then
+        echo "$0: Can't create temp file."
+        fetch_release_failure_usage
+        exit 1
+    fi
+
+    if [ -z "$GITHUB_PAT" ]; then
+        curl -s "$latest_release" > "$temp_file" || return 1
+    else
+        curl -H "Authorization: token $GITHUB_PAT" -s "$latest_release" > "$temp_file" || return 1
+    fi
+
+    latest="$(cat "$temp_file" | grep '"tag_name":' | cut -d ':' -f2 | tr -d '"' | tr -d ',' | tr -d ' ')"
+
+    rm -f "$temp_file"
+    return 0
+}
+
+# Gets the OS by setting the $os variable.
+# Returns 0 in case of success, 1 otherwise.
+get_os() {
+    os_name=$(uname -s)
+    case "$os_name" in
+    'Darwin')
+        os='macos'
+        ;;
+    'Linux')
+        os='linux'
+        ;;
+     'MINGW'*)
+        os='windows'
+        ;;
+    *)
+        return 1
+    esac
+    return 0
+}
+
+# Gets the architecture by setting the $archi variable.
+# Returns 0 in case of success, 1 otherwise.
+get_archi() {
+    architecture=$(uname -m)
+    case "$architecture" in
+    'x86_64' | 'amd64' )
+        archi='amd64'
+        ;;
+    'arm64')
+        # macOS M1/M2
+        if [ $os = 'macos' ]; then
+            archi='apple-silicon'
+        else
+            archi='aarch64'
+        fi
+        ;;
+    'aarch64')
+        archi='aarch64'
+        ;;
+    *)
+        return 1
+    esac
+    return 0
+}
+
+success_usage() {
+    printf "$GREEN%s\n$DEFAULT" "Meilisearch $latest binary successfully downloaded as '$binary_name' file."
+    echo ''
+    echo 'Run it:'
+    echo "    $ ./$PNAME"
+    echo 'Usage:'
+    echo "    $ ./$PNAME --help"
+}
+
+not_available_failure_usage() {
+    printf "$RED%s\n$DEFAULT" 'ERROR: Meilisearch binary is not available for your OS distribution or your architecture yet.'
+    echo ''
+    echo 'However, you can easily compile the binary from the source files.'
+    echo 'Follow the steps at the page ("Source" tab): https://docs.meilisearch.com/learn/getting_started/installation.html'
+}
+
+fetch_release_failure_usage() {
+    echo ''
+    printf "$RED%s\n$DEFAULT" 'ERROR: Impossible to get the latest stable version of Meilisearch.'
+    echo 'Please let us know about this issue: https://github.com/meilisearch/meilisearch/issues/new/choose'
+    echo ''
+    echo 'In the meantime, you can manually download the appropriate binary from the GitHub release assets here: https://github.com/meilisearch/meilisearch/releases/latest'
+}
+
+fill_release_variables() {
+    # Fill $latest variable.
+    if ! get_latest; then
+        fetch_release_failure_usage
+        exit 1
+    fi
+    if [ "$latest" = '' ]; then
+        fetch_release_failure_usage
+        exit 1
+     fi
+     # Fill $os variable.
+     if ! get_os; then
+        not_available_failure_usage
+        exit 1
+     fi
+     # Fill $archi variable.
+     if ! get_archi; then
+        not_available_failure_usage
+        exit 1
+     fi
+}
+
+download_binary() {
+    fill_release_variables
+    echo "Downloading Meilisearch binary $latest for $os, architecture $archi..."
+    case "$os" in
+        'windows')
+            release_file="$PNAME-$os-$archi.exe"
+            binary_name="$PNAME.exe"
+            ;;
+        *)
+            release_file="$PNAME-$os-$archi"
+            binary_name="$PNAME"
+    esac
+    # Fetch the Meilisearch binary.
+    curl --fail -OL "$GITHUB_REL/$latest/$release_file"
+    if [ $? -ne 0 ]; then
+        fetch_release_failure_usage
+        exit 1
+    fi
+    mv "$release_file" "$binary_name"
+    chmod 744 "$binary_name"
+    success_usage
+}
+
+# MAIN
+
+main() {
+    download_binary
+}
+main

dump/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "dump"
+version = "1.0.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "1.0.65"
+flate2 = "1.0.22"
+http = "0.2.8"
+log = "0.4.17"
+meilisearch-auth = { path = "../meilisearch-auth" }
+meilisearch-types = { path = "../meilisearch-types" }
+once_cell = "1.15.0"
+regex = "1.6.0"
+roaring = { version = "0.10.0", features = ["serde"] }
+serde = { version = "1.0.136", features = ["derive"] }
+serde_json = { version = "1.0.85", features = ["preserve_order"] }
+tar = "0.4.38"
+tempfile = "3.3.0"
+thiserror = "1.0.30"
+time = { version = "0.3.7", features = ["serde-well-known", "formatting", "parsing", "macros"] }
+uuid = { version = "1.1.2", features = ["serde", "v4"] }
+
+[dev-dependencies]
+big_s = "1.0.2"
+maplit = "1.0.2"
+meili-snap = { path = "../meili-snap" }
+meilisearch-types = { path = "../meilisearch-types" }

dump/README.md

@@ -0,0 +1,17 @@
+```
+dump
+├── indexes
+│   ├── cattos
+│   │   ├── documents.jsonl
+│   │   └── settings.json
+│   └── doggos
+│       ├── documents.jsonl
+│       └── settings.json
+├── instance-uid.uuid
+├── keys.jsonl
+├── metadata.json
+└── tasks
+    ├── update_files
+    │   └── [task_id].jsonl
+    └── queue.jsonl
+```

dump/src/error.rs

@@ -0,0 +1,34 @@
+use meilisearch_types::error::{Code, ErrorCode};
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("Bad index name.")]
+    BadIndexName,
+    #[error("Malformed task.")]
+    MalformedTask,
+
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+    #[error(transparent)]
+    Serde(#[from] serde_json::Error),
+    #[error(transparent)]
+    Uuid(#[from] uuid::Error),
+}
+
+impl ErrorCode for Error {
+    fn error_code(&self) -> Code {
+        match self {
+            Error::Io(e) => e.error_code(),
+
+            // These errors either happen when creating a dump and don't need any error code,
+            // or come from an internal bad deserialization.
+            Error::Serde(_) => Code::Internal,
+            Error::Uuid(_) => Code::Internal,
+
+            // all these errors should never be raised when creating a dump, thus no error code should be associated.
+            Error::BadIndexName => Code::Internal,
+            Error::MalformedTask => Code::Internal,
+        }
+    }
+}

dump/src/lib.rs

@@ -0,0 +1,463 @@
+#![allow(clippy::type_complexity)]
+#![allow(clippy::wrong_self_convention)]
+
+use meilisearch_types::error::ResponseError;
+use meilisearch_types::keys::Key;
+use meilisearch_types::milli::update::IndexDocumentsMethod;
+use meilisearch_types::settings::Unchecked;
+use meilisearch_types::tasks::{Details, IndexSwap, KindWithContent, Status, Task, TaskId};
+use meilisearch_types::InstanceUid;
+use roaring::RoaringBitmap;
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+
+mod error;
+mod reader;
+mod writer;
+
+pub use error::Error;
+pub use reader::{DumpReader, UpdateFile};
+pub use writer::DumpWriter;
+
+const CURRENT_DUMP_VERSION: Version = Version::V6;
+
+type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Metadata {
+    pub dump_version: Version,
+    pub db_version: String,
+    #[serde(with = "time::serde::rfc3339")]
+    pub dump_date: OffsetDateTime,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct IndexMetadata {
+    pub uid: String,
+    pub primary_key: Option<String>,
+    #[serde(with = "time::serde::rfc3339")]
+    pub created_at: OffsetDateTime,
+    #[serde(with = "time::serde::rfc3339")]
+    pub updated_at: OffsetDateTime,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Deserialize, Serialize)]
+pub enum Version {
+    V1,
+    V2,
+    V3,
+    V4,
+    V5,
+    V6,
+}
+
+#[derive(Debug, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct TaskDump {
+    pub uid: TaskId,
+    #[serde(default)]
+    pub index_uid: Option<String>,
+    pub status: Status,
+    #[serde(rename = "type")]
+    pub kind: KindDump,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub canceled_by: Option<TaskId>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub details: Option<Details>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub error: Option<ResponseError>,
+
+    #[serde(with = "time::serde::rfc3339")]
+    pub enqueued_at: OffsetDateTime,
+    #[serde(
+        with = "time::serde::rfc3339::option",
+        skip_serializing_if = "Option::is_none",
+        default
+    )]
+    pub started_at: Option<OffsetDateTime>,
+    #[serde(
+        with = "time::serde::rfc3339::option",
+        skip_serializing_if = "Option::is_none",
+        default
+    )]
+    pub finished_at: Option<OffsetDateTime>,
+}
+
+// A `Kind` specific version made for the dump. If modified you may break the dump.
+#[derive(Debug, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum KindDump {
+    DocumentImport {
+        primary_key: Option<String>,
+        method: IndexDocumentsMethod,
+        documents_count: u64,
+        allow_index_creation: bool,
+    },
+    DocumentDeletion {
+        documents_ids: Vec<String>,
+    },
+    DocumentClear,
+    Settings {
+        settings: Box<meilisearch_types::settings::Settings<Unchecked>>,
+        is_deletion: bool,
+        allow_index_creation: bool,
+    },
+    IndexDeletion,
+    IndexCreation {
+        primary_key: Option<String>,
+    },
+    IndexUpdate {
+        primary_key: Option<String>,
+    },
+    IndexSwap {
+        swaps: Vec<IndexSwap>,
+    },
+    TaskCancelation {
+        query: String,
+        tasks: RoaringBitmap,
+    },
+    TasksDeletion {
+        query: String,
+        tasks: RoaringBitmap,
+    },
+    DumpCreation {
+        keys: Vec<Key>,
+        instance_uid: Option<InstanceUid>,
+    },
+    SnapshotCreation,
+}
+
+impl From<Task> for TaskDump {
+    fn from(task: Task) -> Self {
+        TaskDump {
+            uid: task.uid,
+            index_uid: task.index_uid().map(|uid| uid.to_string()),
+            status: task.status,
+            kind: task.kind.into(),
+            canceled_by: task.canceled_by,
+            details: task.details,
+            error: task.error,
+            enqueued_at: task.enqueued_at,
+            started_at: task.started_at,
+            finished_at: task.finished_at,
+        }
+    }
+}
+
+impl From<KindWithContent> for KindDump {
+    fn from(kind: KindWithContent) -> Self {
+        match kind {
+            KindWithContent::DocumentAdditionOrUpdate {
+                primary_key,
+                method,
+                documents_count,
+                allow_index_creation,
+                ..
+            } => KindDump::DocumentImport {
+                primary_key,
+                method,
+                documents_count,
+                allow_index_creation,
+            },
+            KindWithContent::DocumentDeletion { documents_ids, .. } => {
+                KindDump::DocumentDeletion { documents_ids }
+            }
+            KindWithContent::DocumentClear { .. } => KindDump::DocumentClear,
+            KindWithContent::SettingsUpdate {
+                new_settings,
+                is_deletion,
+                allow_index_creation,
+                ..
+            } => KindDump::Settings { settings: new_settings, is_deletion, allow_index_creation },
+            KindWithContent::IndexDeletion { .. } => KindDump::IndexDeletion,
+            KindWithContent::IndexCreation { primary_key, .. } => {
+                KindDump::IndexCreation { primary_key }
+            }
+            KindWithContent::IndexUpdate { primary_key, .. } => {
+                KindDump::IndexUpdate { primary_key }
+            }
+            KindWithContent::IndexSwap { swaps } => KindDump::IndexSwap { swaps },
+            KindWithContent::TaskCancelation { query, tasks } => {
+                KindDump::TaskCancelation { query, tasks }
+            }
+            KindWithContent::TaskDeletion { query, tasks } => {
+                KindDump::TasksDeletion { query, tasks }
+            }
+            KindWithContent::DumpCreation { keys, instance_uid } => {
+                KindDump::DumpCreation { keys, instance_uid }
+            }
+            KindWithContent::SnapshotCreation => KindDump::SnapshotCreation,
+        }
+    }
+}
+
+#[cfg(test)]
+pub(crate) mod test {
+    use std::fs::File;
+    use std::io::Seek;
+    use std::str::FromStr;
+
+    use big_s::S;
+    use maplit::btreeset;
+    use meilisearch_types::index_uid::IndexUid;
+    use meilisearch_types::keys::{Action, Key};
+    use meilisearch_types::milli::update::Setting;
+    use meilisearch_types::milli::{self};
+    use meilisearch_types::settings::{Checked, Settings};
+    use meilisearch_types::star_or::StarOr;
+    use meilisearch_types::tasks::{Details, Status};
+    use serde_json::{json, Map, Value};
+    use time::macros::datetime;
+    use uuid::Uuid;
+
+    use crate::reader::Document;
+    use crate::{DumpReader, DumpWriter, IndexMetadata, KindDump, TaskDump, Version};
+
+    pub fn create_test_instance_uid() -> Uuid {
+        Uuid::parse_str("9e15e977-f2ae-4761-943f-1eaf75fd736d").unwrap()
+    }
+
+    pub fn create_test_index_metadata() -> IndexMetadata {
+        IndexMetadata {
+            uid: S("doggo"),
+            primary_key: None,
+            created_at: datetime!(2022-11-20 12:00 UTC),
+            updated_at: datetime!(2022-11-21 00:00 UTC),
+        }
+    }
+
+    pub fn create_test_documents() -> Vec<Map<String, Value>> {
+        vec![
+            json!({ "id": 1, "race": "golden retriever", "name": "paul", "age": 4 })
+                .as_object()
+                .unwrap()
+                .clone(),
+            json!({ "id": 2, "race": "bernese mountain", "name": "tamo", "age": 6 })
+                .as_object()
+                .unwrap()
+                .clone(),
+            json!({ "id": 3, "race": "great pyrenees", "name": "patou", "age": 5 })
+                .as_object()
+                .unwrap()
+                .clone(),
+        ]
+    }
+
+    pub fn create_test_settings() -> Settings<Checked> {
+        let settings = Settings {
+            displayed_attributes: Setting::Set(vec![S("race"), S("name")]),
+            searchable_attributes: Setting::Set(vec![S("name"), S("race")]),
+            filterable_attributes: Setting::Set(btreeset! { S("race"), S("age") }),
+            sortable_attributes: Setting::Set(btreeset! { S("age") }),
+            ranking_rules: Setting::NotSet,
+            stop_words: Setting::NotSet,
+            synonyms: Setting::NotSet,
+            distinct_attribute: Setting::NotSet,
+            typo_tolerance: Setting::NotSet,
+            faceting: Setting::NotSet,
+            pagination: Setting::NotSet,
+            _kind: std::marker::PhantomData,
+        };
+        settings.check()
+    }
+
+    pub fn create_test_tasks() -> Vec<(TaskDump, Option<Vec<Document>>)> {
+        vec![
+            (
+                TaskDump {
+                    uid: 0,
+                    index_uid: Some(S("doggo")),
+                    status: Status::Succeeded,
+                    kind: KindDump::DocumentImport {
+                        method: milli::update::IndexDocumentsMethod::UpdateDocuments,
+                        allow_index_creation: true,
+                        primary_key: Some(S("bone")),
+                        documents_count: 12,
+                    },
+                    canceled_by: None,
+                    details: Some(Details::DocumentAdditionOrUpdate {
+                        received_documents: 12,
+                        indexed_documents: Some(10),
+                    }),
+                    error: None,
+                    enqueued_at: datetime!(2022-11-11 0:00 UTC),
+                    started_at: Some(datetime!(2022-11-20 0:00 UTC)),
+                    finished_at: Some(datetime!(2022-11-21 0:00 UTC)),
+                },
+                None,
+            ),
+            (
+                TaskDump {
+                    uid: 1,
+                    index_uid: Some(S("doggo")),
+                    status: Status::Enqueued,
+                    kind: KindDump::DocumentImport {
+                        method: milli::update::IndexDocumentsMethod::UpdateDocuments,
+                        allow_index_creation: true,
+                        primary_key: None,
+                        documents_count: 2,
+                    },
+                    canceled_by: None,
+                    details: Some(Details::DocumentAdditionOrUpdate {
+                        received_documents: 2,
+                        indexed_documents: None,
+                    }),
+                    error: None,
+                    enqueued_at: datetime!(2022-11-11 0:00 UTC),
+                    started_at: None,
+                    finished_at: None,
+                },
+                Some(vec![
+                    json!({ "id": 4, "race": "leonberg" }).as_object().unwrap().clone(),
+                    json!({ "id": 5, "race": "patou" }).as_object().unwrap().clone(),
+                ]),
+            ),
+            (
+                TaskDump {
+                    uid: 5,
+                    index_uid: Some(S("catto")),
+                    status: Status::Enqueued,
+                    kind: KindDump::IndexDeletion,
+                    canceled_by: None,
+                    details: None,
+                    error: None,
+                    enqueued_at: datetime!(2022-11-15 0:00 UTC),
+                    started_at: None,
+                    finished_at: None,
+                },
+                None,
+            ),
+        ]
+    }
+
+    pub fn create_test_api_keys() -> Vec<Key> {
+        vec![
+            Key {
+                description: Some(S("The main key to manage all the doggos")),
+                name: Some(S("doggos_key")),
+                uid: Uuid::from_str("9f8a34da-b6b2-42f0-939b-dbd4c3448655").unwrap(),
+                actions: vec![Action::DocumentsAll],
+                indexes: vec![StarOr::Other(IndexUid::from_str("doggos").unwrap())],
+                expires_at: Some(datetime!(4130-03-14 12:21 UTC)),
+                created_at: datetime!(1960-11-15 0:00 UTC),
+                updated_at: datetime!(2022-11-10 0:00 UTC),
+            },
+            Key {
+                description: Some(S("The master key for everything and even the doggos")),
+                name: Some(S("master_key")),
+                uid: Uuid::from_str("4622f717-1c00-47bb-a494-39d76a49b591").unwrap(),
+                actions: vec![Action::All],
+                indexes: vec![StarOr::Star],
+                expires_at: None,
+                created_at: datetime!(0000-01-01 00:01 UTC),
+                updated_at: datetime!(1964-05-04 17:25 UTC),
+            },
+            Key {
+                description: Some(S("The useless key to for nothing nor the doggos")),
+                name: Some(S("useless_key")),
+                uid: Uuid::from_str("fb80b58b-0a34-412f-8ba7-1ce868f8ac5c").unwrap(),
+                actions: vec![],
+                indexes: vec![],
+                expires_at: None,
+                created_at: datetime!(400-02-29 0:00 UTC),
+                updated_at: datetime!(1024-02-29 0:00 UTC),
+            },
+        ]
+    }
+
+    pub fn create_test_dump() -> File {
+        let instance_uid = create_test_instance_uid();
+        let dump = DumpWriter::new(Some(instance_uid)).unwrap();
+
+        // ========== Adding an index
+        let documents = create_test_documents();
+        let settings = create_test_settings();
+
+        let mut index = dump.create_index("doggos", &create_test_index_metadata()).unwrap();
+        for document in &documents {
+            index.push_document(document).unwrap();
+        }
+        index.flush().unwrap();
+        index.settings(&settings).unwrap();
+
+        // ========== pushing the task queue
+        let tasks = create_test_tasks();
+
+        let mut task_queue = dump.create_tasks_queue().unwrap();
+        for (task, update_file) in &tasks {
+            let mut update = task_queue.push_task(task).unwrap();
+            if let Some(update_file) = update_file {
+                for u in update_file {
+                    update.push_document(u).unwrap();
+                }
+            }
+        }
+        task_queue.flush().unwrap();
+
+        // ========== pushing the api keys
+        let api_keys = create_test_api_keys();
+
+        let mut keys = dump.create_keys().unwrap();
+        for key in &api_keys {
+            keys.push_key(key).unwrap();
+        }
+        keys.flush().unwrap();
+
+        // create the dump
+        let mut file = tempfile::tempfile().unwrap();
+        dump.persist_to(&mut file).unwrap();
+        file.rewind().unwrap();
+
+        file
+    }
+
+    #[test]
+    fn test_creating_and_read_dump() {
+        let mut file = create_test_dump();
+        let mut dump = DumpReader::open(&mut file).unwrap();
+
+        // ==== checking the top level infos
+        assert_eq!(dump.version(), Version::V6);
+        assert!(dump.date().is_some());
+        assert_eq!(dump.instance_uid().unwrap().unwrap(), create_test_instance_uid());
+
+        // ==== checking the index
+        let mut indexes = dump.indexes().unwrap();
+        let mut index = indexes.next().unwrap().unwrap();
+        assert!(indexes.next().is_none()); // there was only one index in the dump
+
+        for (document, expected) in index.documents().unwrap().zip(create_test_documents()) {
+            assert_eq!(document.unwrap(), expected);
+        }
+        assert_eq!(index.settings().unwrap(), create_test_settings());
+        assert_eq!(index.metadata(), &create_test_index_metadata());
+
+        drop(index);
+        drop(indexes);
+
+        // ==== checking the task queue
+        for (task, expected) in dump.tasks().unwrap().zip(create_test_tasks()) {
+            let (task, content_file) = task.unwrap();
+            assert_eq!(task, expected.0);
+
+            if let Some(expected_update) = expected.1 {
+                assert!(
+                    content_file.is_some(),
+                    "A content file was expected for the task {}.",
+                    expected.0.uid
+                );
+                let updates = content_file.unwrap().collect::<Result<Vec<_>, _>>().unwrap();
+                assert_eq!(updates, expected_update);
+            }
+        }
+
+        // ==== checking the keys
+        for (key, expected) in dump.keys().unwrap().zip(create_test_api_keys()) {
+            assert_eq!(key.unwrap(), expected);
+        }
+    }
+}

dump/src/reader/compat/mod.rs

@@ -0,0 +1,5 @@
+pub mod v1_to_v2;
+pub mod v2_to_v3;
+pub mod v3_to_v4;
+pub mod v4_to_v5;
+pub mod v5_to_v6;

dump/src/reader/compat/snapshots/dump__reader__compat__v1_to_v2__test__compat_v1_v2-3.snap

@@ -0,0 +1,38 @@
+---
+source: dump/src/reader/compat/v1_to_v2.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "typo",
+    "words",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v1_to_v2__test__compat_v1_v2-6.snap

@@ -0,0 +1,31 @@
+---
+source: dump/src/reader/compat/v1_to_v2.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [
+    "genres",
+    "id"
+  ],
+  "sortableAttributes": [
+    "genres",
+    "id"
+  ],
+  "rankingRules": [
+    "typo",
+    "words",
+    "proximity",
+    "attribute",
+    "exactness",
+    "release_date:asc"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v1_to_v2__test__compat_v1_v2-9.snap

@@ -0,0 +1,24 @@
+---
+source: dump/src/reader/compat/v1_to_v2.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "typo",
+    "words",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v2_to_v3__test__compat_v2_v3-11.snap

@@ -0,0 +1,23 @@
+---
+source: dump/src/reader/compat/v2_to_v3.rs
+expression: movies2.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v2_to_v3__test__compat_v2_v3-14.snap

@@ -0,0 +1,23 @@
+---
+source: dump/src/reader/compat/v2_to_v3.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v2_to_v3__test__compat_v2_v3-5.snap

@@ -0,0 +1,37 @@
+---
+source: dump/src/reader/compat/v2_to_v3.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v2_to_v3__test__compat_v2_v3-8.snap

@@ -0,0 +1,24 @@
+---
+source: dump/src/reader/compat/v2_to_v3.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "exactness",
+    "release_date:asc"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v3_to_v4__test__compat_v3_v4-12.snap

@@ -0,0 +1,25 @@
+---
+source: dump/src/reader/compat/v3_to_v4.rs
+expression: movies2.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v3_to_v4__test__compat_v3_v4-15.snap

@@ -0,0 +1,25 @@
+---
+source: dump/src/reader/compat/v3_to_v4.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v3_to_v4__test__compat_v3_v4-6.snap

@@ -0,0 +1,39 @@
+---
+source: dump/src/reader/compat/v3_to_v4.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v3_to_v4__test__compat_v3_v4-9.snap

@@ -0,0 +1,31 @@
+---
+source: dump/src/reader/compat/v3_to_v4.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [
+    "genres",
+    "id"
+  ],
+  "sortableAttributes": [
+    "release_date"
+  ],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness",
+    "release_date:asc"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v4_to_v5__test__compat_v4_v5-12.snap

@@ -0,0 +1,56 @@
+---
+source: dump/src/reader/compat/v4_to_v5.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": "Reset",
+  "searchableAttributes": "Reset",
+  "filterableAttributes": {
+    "Set": []
+  },
+  "sortableAttributes": {
+    "Set": []
+  },
+  "rankingRules": {
+    "Set": [
+      "words",
+      "typo",
+      "proximity",
+      "attribute",
+      "sort",
+      "exactness"
+    ]
+  },
+  "stopWords": {
+    "Set": []
+  },
+  "synonyms": {
+    "Set": {}
+  },
+  "distinctAttribute": "Reset",
+  "typoTolerance": {
+    "Set": {
+      "enabled": {
+        "Set": true
+      },
+      "minWordSizeForTypos": {
+        "Set": {
+          "oneTypo": {
+            "Set": 5
+          },
+          "twoTypos": {
+            "Set": 9
+          }
+        }
+      },
+      "disableOnWords": {
+        "Set": []
+      },
+      "disableOnAttributes": {
+        "Set": []
+      }
+    }
+  },
+  "faceting": "NotSet",
+  "pagination": "NotSet"
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v4_to_v5__test__compat_v4_v5-6.snap

@@ -0,0 +1,70 @@
+---
+source: dump/src/reader/compat/v4_to_v5.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": "Reset",
+  "searchableAttributes": "Reset",
+  "filterableAttributes": {
+    "Set": []
+  },
+  "sortableAttributes": {
+    "Set": []
+  },
+  "rankingRules": {
+    "Set": [
+      "words",
+      "typo",
+      "proximity",
+      "attribute",
+      "sort",
+      "exactness"
+    ]
+  },
+  "stopWords": {
+    "Set": []
+  },
+  "synonyms": {
+    "Set": {
+      "android": [
+        "phone",
+        "smartphone"
+      ],
+      "iphone": [
+        "phone",
+        "smartphone"
+      ],
+      "phone": [
+        "android",
+        "iphone",
+        "smartphone"
+      ]
+    }
+  },
+  "distinctAttribute": "Reset",
+  "typoTolerance": {
+    "Set": {
+      "enabled": {
+        "Set": true
+      },
+      "minWordSizeForTypos": {
+        "Set": {
+          "oneTypo": {
+            "Set": 5
+          },
+          "twoTypos": {
+            "Set": 9
+          }
+        }
+      },
+      "disableOnWords": {
+        "Set": []
+      },
+      "disableOnAttributes": {
+        "Set": []
+      }
+    }
+  },
+  "faceting": "NotSet",
+  "pagination": "NotSet"
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v4_to_v5__test__compat_v4_v5-9.snap

@@ -0,0 +1,62 @@
+---
+source: dump/src/reader/compat/v4_to_v5.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": "Reset",
+  "searchableAttributes": "Reset",
+  "filterableAttributes": {
+    "Set": [
+      "genres",
+      "id"
+    ]
+  },
+  "sortableAttributes": {
+    "Set": [
+      "release_date"
+    ]
+  },
+  "rankingRules": {
+    "Set": [
+      "words",
+      "typo",
+      "proximity",
+      "attribute",
+      "sort",
+      "exactness",
+      "release_date:asc"
+    ]
+  },
+  "stopWords": {
+    "Set": []
+  },
+  "synonyms": {
+    "Set": {}
+  },
+  "distinctAttribute": "Reset",
+  "typoTolerance": {
+    "Set": {
+      "enabled": {
+        "Set": true
+      },
+      "minWordSizeForTypos": {
+        "Set": {
+          "oneTypo": {
+            "Set": 5
+          },
+          "twoTypos": {
+            "Set": 9
+          }
+        }
+      },
+      "disableOnWords": {
+        "Set": []
+      },
+      "disableOnAttributes": {
+        "Set": []
+      }
+    }
+  },
+  "faceting": "NotSet",
+  "pagination": "NotSet"
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v5_to_v6__test__compat_v5_v6-12.snap

@@ -0,0 +1,40 @@
+---
+source: dump/src/reader/compat/v5_to_v6.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null,
+  "typoTolerance": {
+    "enabled": true,
+    "minWordSizeForTypos": {
+      "oneTypo": 5,
+      "twoTypos": 9
+    },
+    "disableOnWords": [],
+    "disableOnAttributes": []
+  },
+  "faceting": {
+    "maxValuesPerFacet": 100
+  },
+  "pagination": {
+    "maxTotalHits": 1000
+  }
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v5_to_v6__test__compat_v5_v6-6.snap

@@ -0,0 +1,54 @@
+---
+source: dump/src/reader/compat/v5_to_v6.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "distinctAttribute": null,
+  "typoTolerance": {
+    "enabled": true,
+    "minWordSizeForTypos": {
+      "oneTypo": 5,
+      "twoTypos": 9
+    },
+    "disableOnWords": [],
+    "disableOnAttributes": []
+  },
+  "faceting": {
+    "maxValuesPerFacet": 100
+  },
+  "pagination": {
+    "maxTotalHits": 1000
+  }
+}

dump/src/reader/compat/snapshots/dump__reader__compat__v5_to_v6__test__compat_v5_v6-9.snap

@@ -0,0 +1,46 @@
+---
+source: dump/src/reader/compat/v5_to_v6.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [
+    "genres",
+    "id"
+  ],
+  "sortableAttributes": [
+    "release_date"
+  ],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness",
+    "release_date:asc"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null,
+  "typoTolerance": {
+    "enabled": true,
+    "minWordSizeForTypos": {
+      "oneTypo": 5,
+      "twoTypos": 9
+    },
+    "disableOnWords": [],
+    "disableOnAttributes": []
+  },
+  "faceting": {
+    "maxValuesPerFacet": 100
+  },
+  "pagination": {
+    "maxTotalHits": 1000
+  }
+}

dump/src/reader/compat/v1_to_v2.rs

@@ -0,0 +1,410 @@
+use std::str::FromStr;
+
+use super::v2_to_v3::CompatV2ToV3;
+use crate::reader::{v1, v2, Document};
+use crate::Result;
+
+pub struct CompatV1ToV2 {
+    pub from: v1::V1Reader,
+}
+
+impl CompatV1ToV2 {
+    pub fn new(v1: v1::V1Reader) -> Self {
+        Self { from: v1 }
+    }
+
+    pub fn to_v3(self) -> CompatV2ToV3 {
+        CompatV2ToV3::Compat(self)
+    }
+
+    pub fn version(&self) -> crate::Version {
+        self.from.version()
+    }
+
+    pub fn date(&self) -> Option<time::OffsetDateTime> {
+        self.from.date()
+    }
+
+    pub fn index_uuid(&self) -> Vec<v2::meta::IndexUuid> {
+        self.from
+            .index_uuid()
+            .into_iter()
+            .enumerate()
+            // we use the index of the index 😬 as UUID for the index, so that we can link the v2::Task to their index
+            .map(|(index, index_uuid)| v2::meta::IndexUuid {
+                uid: index_uuid.uid,
+                uuid: uuid::Uuid::from_u128(index as u128),
+            })
+            .collect()
+    }
+
+    pub fn indexes(&self) -> Result<impl Iterator<Item = Result<CompatIndexV1ToV2>> + '_> {
+        Ok(self.from.indexes()?.map(|index_reader| Ok(CompatIndexV1ToV2 { from: index_reader? })))
+    }
+
+    pub fn tasks(
+        &mut self,
+    ) -> Box<dyn Iterator<Item = Result<(v2::Task, Option<v2::UpdateFile>)>> + '_> {
+        // Convert an error here to an iterator yielding the error
+        let indexes = match self.from.indexes() {
+            Ok(indexes) => indexes,
+            Err(err) => return Box::new(std::iter::once(Err(err))),
+        };
+        let it = indexes.enumerate().flat_map(
+            move |(index, index_reader)| -> Box<dyn Iterator<Item = _>> {
+                let index_reader = match index_reader {
+                    Ok(index_reader) => index_reader,
+                    Err(err) => return Box::new(std::iter::once(Err(err))),
+                };
+                Box::new(
+                    index_reader
+                        .tasks()
+                        // Filter out the UpdateStatus::Customs variant that is not supported in v2
+                        // and enqueued tasks, that don't contain the necessary update file in v1
+                        .filter_map(move |task| -> Option<_> {
+                            let task = match task {
+                                Ok(task) => task,
+                                Err(err) => return Some(Err(err)),
+                            };
+                            Some(Ok((
+                                v2::Task {
+                                    uuid: uuid::Uuid::from_u128(index as u128),
+                                    update: Option::from(task)?,
+                                },
+                                None,
+                            )))
+                        }),
+                )
+            },
+        );
+        Box::new(it)
+    }
+}
+
+pub struct CompatIndexV1ToV2 {
+    pub from: v1::V1IndexReader,
+}
+
+impl CompatIndexV1ToV2 {
+    pub fn metadata(&self) -> &crate::IndexMetadata {
+        self.from.metadata()
+    }
+
+    pub fn documents(&mut self) -> Result<Box<dyn Iterator<Item = Result<Document>> + '_>> {
+        self.from.documents().map(|it| Box::new(it) as Box<dyn Iterator<Item = _>>)
+    }
+
+    pub fn settings(&mut self) -> Result<v2::settings::Settings<v2::settings::Checked>> {
+        Ok(v2::settings::Settings::<v2::settings::Unchecked>::from(self.from.settings()?).check())
+    }
+}
+
+impl From<v1::settings::Settings> for v2::Settings<v2::Unchecked> {
+    fn from(source: v1::settings::Settings) -> Self {
+        Self {
+            displayed_attributes: option_to_setting(source.displayed_attributes)
+                .map(|displayed| displayed.into_iter().collect()),
+            searchable_attributes: option_to_setting(source.searchable_attributes),
+            filterable_attributes: option_to_setting(source.attributes_for_faceting.clone())
+                .map(|filterable| filterable.into_iter().collect()),
+            sortable_attributes: option_to_setting(source.attributes_for_faceting)
+                .map(|sortable| sortable.into_iter().collect()),
+            ranking_rules: option_to_setting(source.ranking_rules).map(|ranking_rules| {
+                ranking_rules
+                    .into_iter()
+                    .filter_map(|ranking_rule| {
+                        match v1::settings::RankingRule::from_str(&ranking_rule) {
+                            Ok(ranking_rule) => {
+                                let criterion: Option<v2::settings::Criterion> =
+                                    ranking_rule.into();
+                                criterion.as_ref().map(ToString::to_string)
+                            }
+                            Err(()) => {
+                                log::warn!(
+                                    "Could not import the following ranking rule: `{}`.",
+                                    ranking_rule
+                                );
+                                None
+                            }
+                        }
+                    })
+                    .collect()
+            }),
+            stop_words: option_to_setting(source.stop_words),
+            synonyms: option_to_setting(source.synonyms),
+            distinct_attribute: option_to_setting(source.distinct_attribute),
+            _kind: std::marker::PhantomData,
+        }
+    }
+}
+
+fn option_to_setting<T>(opt: Option<Option<T>>) -> v2::Setting<T> {
+    match opt {
+        Some(Some(t)) => v2::Setting::Set(t),
+        None => v2::Setting::NotSet,
+        Some(None) => v2::Setting::Reset,
+    }
+}
+
+impl From<v1::update::UpdateStatus> for Option<v2::updates::UpdateStatus> {
+    fn from(source: v1::update::UpdateStatus) -> Self {
+        use v1::update::UpdateStatus as UpdateStatusV1;
+        use v2::updates::UpdateStatus as UpdateStatusV2;
+        Some(match source {
+            UpdateStatusV1::Enqueued { content } => {
+                log::warn!(
+                    "Cannot import task {} (importing enqueued tasks from v1 dumps is unsupported)",
+                    content.update_id
+                );
+                log::warn!("Task will be skipped in the queue of imported tasks.");
+
+                return None;
+            }
+            UpdateStatusV1::Failed { content } => UpdateStatusV2::Failed(v2::updates::Failed {
+                from: v2::updates::Processing {
+                    from: v2::updates::Enqueued {
+                        update_id: content.update_id,
+                        meta: Option::from(content.update_type)?,
+                        enqueued_at: content.enqueued_at,
+                        content: None,
+                    },
+                    started_processing_at: content.processed_at
+                        - std::time::Duration::from_secs_f64(content.duration),
+                },
+                error: v2::ResponseError {
+                    // error code is ignored by serialization, and so always default in deserialized v2 dumps
+                    // that's a good thing, because we don't have them in v1 dump 😅
+                    code: http::StatusCode::default(),
+                    message: content.error.unwrap_or_default(),
+                    // error codes are unchanged between v1 and v2
+                    error_code: content.error_code.unwrap_or_default(),
+                    // error types are unchanged between v1 and v2
+                    error_type: content.error_type.unwrap_or_default(),
+                    // error links are unchanged between v1 and v2
+                    error_link: content.error_link.unwrap_or_default(),
+                },
+                failed_at: content.processed_at,
+            }),
+            UpdateStatusV1::Processed { content } => {
+                UpdateStatusV2::Processed(v2::updates::Processed {
+                    success: match &content.update_type {
+                        v1::update::UpdateType::ClearAll => {
+                            v2::updates::UpdateResult::DocumentDeletion { deleted: u64::MAX }
+                        }
+                        v1::update::UpdateType::Customs => v2::updates::UpdateResult::Other,
+                        v1::update::UpdateType::DocumentsAddition { number } => {
+                            v2::updates::UpdateResult::DocumentsAddition(
+                                v2::updates::DocumentAdditionResult { nb_documents: *number },
+                            )
+                        }
+                        v1::update::UpdateType::DocumentsPartial { number } => {
+                            v2::updates::UpdateResult::DocumentsAddition(
+                                v2::updates::DocumentAdditionResult { nb_documents: *number },
+                            )
+                        }
+                        v1::update::UpdateType::DocumentsDeletion { number } => {
+                            v2::updates::UpdateResult::DocumentDeletion { deleted: *number as u64 }
+                        }
+                        v1::update::UpdateType::Settings { .. } => v2::updates::UpdateResult::Other,
+                    },
+                    processed_at: content.processed_at,
+                    from: v2::updates::Processing {
+                        from: v2::updates::Enqueued {
+                            update_id: content.update_id,
+                            meta: Option::from(content.update_type)?,
+                            enqueued_at: content.enqueued_at,
+                            content: None,
+                        },
+                        started_processing_at: content.processed_at
+                            - std::time::Duration::from_secs_f64(content.duration),
+                    },
+                })
+            }
+        })
+    }
+}
+
+impl From<v1::update::UpdateType> for Option<v2::updates::UpdateMeta> {
+    fn from(source: v1::update::UpdateType) -> Self {
+        Some(match source {
+            v1::update::UpdateType::ClearAll => v2::updates::UpdateMeta::ClearDocuments,
+            v1::update::UpdateType::Customs => {
+                log::warn!("Ignoring task with type 'Customs' that is no longer supported");
+                return None;
+            }
+            v1::update::UpdateType::DocumentsAddition { .. } => {
+                v2::updates::UpdateMeta::DocumentsAddition {
+                    method: v2::updates::IndexDocumentsMethod::ReplaceDocuments,
+                    format: v2::updates::UpdateFormat::Json,
+                    primary_key: None,
+                }
+            }
+            v1::update::UpdateType::DocumentsPartial { .. } => {
+                v2::updates::UpdateMeta::DocumentsAddition {
+                    method: v2::updates::IndexDocumentsMethod::UpdateDocuments,
+                    format: v2::updates::UpdateFormat::Json,
+                    primary_key: None,
+                }
+            }
+            v1::update::UpdateType::DocumentsDeletion { .. } => {
+                v2::updates::UpdateMeta::DeleteDocuments { ids: vec![] }
+            }
+            v1::update::UpdateType::Settings { settings } => {
+                v2::updates::UpdateMeta::Settings((*settings).into())
+            }
+        })
+    }
+}
+
+impl From<v1::settings::SettingsUpdate> for v2::Settings<v2::Unchecked> {
+    fn from(source: v1::settings::SettingsUpdate) -> Self {
+        let ranking_rules = v2::Setting::from(source.ranking_rules);
+
+        // go from the concrete types of v1 (RankingRule) to the concrete type of v2 (Criterion),
+        // and then back to string as this is what the settings manipulate
+        let ranking_rules = ranking_rules.map(|ranking_rules| {
+            ranking_rules
+                .into_iter()
+                // filter out the WordsPosition ranking rule that exists in v1 but not v2
+                .filter_map(Option::<v2::settings::Criterion>::from)
+                .map(|criterion| criterion.to_string())
+                .collect()
+        });
+
+        Self {
+            displayed_attributes: v2::Setting::from(source.displayed_attributes)
+                .map(|displayed_attributes| displayed_attributes.into_iter().collect()),
+            searchable_attributes: source.searchable_attributes.into(),
+            filterable_attributes: v2::Setting::from(source.attributes_for_faceting.clone())
+                .map(|attributes_for_faceting| attributes_for_faceting.into_iter().collect()),
+            sortable_attributes: v2::Setting::from(source.attributes_for_faceting)
+                .map(|attributes_for_faceting| attributes_for_faceting.into_iter().collect()),
+            ranking_rules,
+            stop_words: source.stop_words.into(),
+            synonyms: source.synonyms.into(),
+            distinct_attribute: source.distinct_attribute.into(),
+            _kind: std::marker::PhantomData,
+        }
+    }
+}
+
+impl From<v1::settings::RankingRule> for Option<v2::settings::Criterion> {
+    fn from(source: v1::settings::RankingRule) -> Self {
+        match source {
+            v1::settings::RankingRule::Typo => Some(v2::settings::Criterion::Typo),
+            v1::settings::RankingRule::Words => Some(v2::settings::Criterion::Words),
+            v1::settings::RankingRule::Proximity => Some(v2::settings::Criterion::Proximity),
+            v1::settings::RankingRule::Attribute => Some(v2::settings::Criterion::Attribute),
+            v1::settings::RankingRule::WordsPosition => {
+                log::warn!("Removing the 'WordsPosition' ranking rule that is no longer supported, please check the resulting ranking rules of your indexes");
+                None
+            }
+            v1::settings::RankingRule::Exactness => Some(v2::settings::Criterion::Exactness),
+            v1::settings::RankingRule::Asc(field_name) => {
+                Some(v2::settings::Criterion::Asc(field_name))
+            }
+            v1::settings::RankingRule::Desc(field_name) => {
+                Some(v2::settings::Criterion::Desc(field_name))
+            }
+        }
+    }
+}
+
+impl<T> From<v1::settings::UpdateState<T>> for v2::Setting<T> {
+    fn from(source: v1::settings::UpdateState<T>) -> Self {
+        match source {
+            v1::settings::UpdateState::Update(new_value) => v2::Setting::Set(new_value),
+            v1::settings::UpdateState::Clear => v2::Setting::Reset,
+            v1::settings::UpdateState::Nothing => v2::Setting::NotSet,
+        }
+    }
+}
+
+#[cfg(test)]
+pub(crate) mod test {
+    use std::fs::File;
+    use std::io::BufReader;
+
+    use flate2::bufread::GzDecoder;
+    use meili_snap::insta;
+    use tempfile::TempDir;
+
+    use super::*;
+
+    #[test]
+    fn compat_v1_v2() {
+        let dump = File::open("tests/assets/v1.dump").unwrap();
+        let dir = TempDir::new().unwrap();
+        let mut dump = BufReader::new(dump);
+        let gz = GzDecoder::new(&mut dump);
+        let mut archive = tar::Archive::new(gz);
+        archive.unpack(dir.path()).unwrap();
+
+        let mut dump = v1::V1Reader::open(dir).unwrap().to_v2();
+
+        // top level infos
+        assert_eq!(dump.date(), None);
+
+        // tasks
+        let tasks = dump.tasks().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"2298010973ee98cf4670787314176a3a");
+        assert_eq!(update_files.len(), 9);
+        assert!(update_files[..].iter().all(|u| u.is_none())); // no update file in dumps v1
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "2022-10-02T13:23:39.976870431Z",
+          "updatedAt": "2022-10-02T13:27:54.353262482Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"b01c8371aea4c7171af0d4d846a2bdca");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "2022-10-02T13:15:29.477512777Z",
+          "updatedAt": "2022-10-02T13:21:12.671204856Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"b63dbed5bbc059f3e32bc471ae699bf5");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "2022-10-02T13:38:26.358882984Z",
+          "updatedAt": "2022-10-02T13:38:26.385609433Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"aa24c0cfc733d66c396237ad44263bed");
+    }
+}

dump/src/reader/compat/v2_to_v3.rs

@@ -0,0 +1,514 @@
+use std::convert::TryInto;
+use std::str::FromStr;
+
+use time::OffsetDateTime;
+use uuid::Uuid;
+
+use super::v1_to_v2::{CompatIndexV1ToV2, CompatV1ToV2};
+use super::v3_to_v4::CompatV3ToV4;
+use crate::reader::{v2, v3, Document};
+use crate::Result;
+
+pub enum CompatV2ToV3 {
+    V2(v2::V2Reader),
+    Compat(CompatV1ToV2),
+}
+
+impl CompatV2ToV3 {
+    pub fn new(v2: v2::V2Reader) -> CompatV2ToV3 {
+        CompatV2ToV3::V2(v2)
+    }
+
+    pub fn index_uuid(&self) -> Vec<v3::meta::IndexUuid> {
+        let v2_uuids = match self {
+            CompatV2ToV3::V2(from) => from.index_uuid(),
+            CompatV2ToV3::Compat(compat) => compat.index_uuid(),
+        };
+        v2_uuids
+            .into_iter()
+            .into_iter()
+            .map(|index| v3::meta::IndexUuid { uid: index.uid, uuid: index.uuid })
+            .collect()
+    }
+
+    pub fn to_v4(self) -> CompatV3ToV4 {
+        CompatV3ToV4::Compat(self)
+    }
+
+    pub fn version(&self) -> crate::Version {
+        match self {
+            CompatV2ToV3::V2(from) => from.version(),
+            CompatV2ToV3::Compat(compat) => compat.version(),
+        }
+    }
+
+    pub fn date(&self) -> Option<time::OffsetDateTime> {
+        match self {
+            CompatV2ToV3::V2(from) => from.date(),
+            CompatV2ToV3::Compat(compat) => compat.date(),
+        }
+    }
+
+    pub fn instance_uid(&self) -> Result<Option<uuid::Uuid>> {
+        Ok(None)
+    }
+
+    pub fn indexes(&self) -> Result<impl Iterator<Item = Result<CompatIndexV2ToV3>> + '_> {
+        Ok(match self {
+            CompatV2ToV3::V2(from) => Box::new(from.indexes()?.map(|index_reader| -> Result<_> {
+                let compat = CompatIndexV2ToV3::new(index_reader?);
+                Ok(compat)
+            }))
+                as Box<dyn Iterator<Item = Result<CompatIndexV2ToV3>> + '_>,
+            CompatV2ToV3::Compat(compat) => Box::new(compat.indexes()?.map(|index_reader| {
+                let compat = CompatIndexV2ToV3::Compat(Box::new(index_reader?));
+                Ok(compat)
+            }))
+                as Box<dyn Iterator<Item = Result<CompatIndexV2ToV3>> + '_>,
+        })
+    }
+
+    pub fn tasks(
+        &mut self,
+    ) -> Box<
+        dyn Iterator<Item = Result<(v3::Task, Option<Box<dyn Iterator<Item = Result<Document>>>>)>>
+            + '_,
+    > {
+        let tasks = match self {
+            CompatV2ToV3::V2(from) => from.tasks(),
+            CompatV2ToV3::Compat(compat) => compat.tasks(),
+        };
+
+        Box::new(
+            tasks
+                .map(move |task| {
+                    task.map(|(task, content_file)| {
+                        let task = v3::Task { uuid: task.uuid, update: task.update.into() };
+
+                        Some((
+                            task,
+                            content_file.map(|content_file| {
+                                Box::new(content_file) as Box<dyn Iterator<Item = Result<Document>>>
+                            }),
+                        ))
+                    })
+                })
+                .filter_map(|res| res.transpose()),
+        )
+    }
+}
+
+pub enum CompatIndexV2ToV3 {
+    V2(v2::V2IndexReader),
+    Compat(Box<CompatIndexV1ToV2>),
+}
+
+impl CompatIndexV2ToV3 {
+    pub fn new(v2: v2::V2IndexReader) -> CompatIndexV2ToV3 {
+        CompatIndexV2ToV3::V2(v2)
+    }
+
+    pub fn metadata(&self) -> &crate::IndexMetadata {
+        match self {
+            CompatIndexV2ToV3::V2(from) => from.metadata(),
+            CompatIndexV2ToV3::Compat(compat) => compat.metadata(),
+        }
+    }
+
+    pub fn documents(&mut self) -> Result<Box<dyn Iterator<Item = Result<Document>> + '_>> {
+        match self {
+            CompatIndexV2ToV3::V2(from) => from
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<Document>> + '_>),
+            CompatIndexV2ToV3::Compat(compat) => compat.documents(),
+        }
+    }
+
+    pub fn settings(&mut self) -> Result<v3::Settings<v3::Checked>> {
+        let settings = match self {
+            CompatIndexV2ToV3::V2(from) => from.settings()?,
+            CompatIndexV2ToV3::Compat(compat) => compat.settings()?,
+        };
+        Ok(v3::Settings::<v3::Unchecked>::from(settings).check())
+    }
+}
+
+impl From<v2::updates::UpdateStatus> for v3::updates::UpdateStatus {
+    fn from(update: v2::updates::UpdateStatus) -> Self {
+        match update {
+            v2::updates::UpdateStatus::Processing(processing) => {
+                match (processing.from.meta.clone(), processing.from.content).try_into() {
+                    Ok(meta) => v3::updates::UpdateStatus::Processing(v3::updates::Processing {
+                        from: v3::updates::Enqueued {
+                            update_id: processing.from.update_id,
+                            meta,
+                            enqueued_at: processing.from.enqueued_at,
+                        },
+                        started_processing_at: processing.started_processing_at,
+                    }),
+                    Err(e) => {
+                        log::warn!("Error with task {}: {}", processing.from.update_id, e);
+                        log::warn!("Task will be marked as `Failed`.");
+                        v3::updates::UpdateStatus::Failed(v3::updates::Failed {
+                            from: v3::updates::Processing {
+                                from: v3::updates::Enqueued {
+                                    update_id: processing.from.update_id,
+                                    meta: update_from_unchecked_update_meta(processing.from.meta),
+                                    enqueued_at: processing.from.enqueued_at,
+                                },
+                                started_processing_at: processing.started_processing_at,
+                            },
+                            msg: e.to_string(),
+                            code: v3::Code::MalformedDump,
+                            failed_at: OffsetDateTime::now_utc(),
+                        })
+                    }
+                }
+            }
+            v2::updates::UpdateStatus::Enqueued(enqueued) => {
+                match (enqueued.meta.clone(), enqueued.content).try_into() {
+                    Ok(meta) => v3::updates::UpdateStatus::Enqueued(v3::updates::Enqueued {
+                        update_id: enqueued.update_id,
+                        meta,
+                        enqueued_at: enqueued.enqueued_at,
+                    }),
+                    Err(e) => {
+                        log::warn!("Error with task {}: {}", enqueued.update_id, e);
+                        log::warn!("Task will be marked as `Failed`.");
+                        v3::updates::UpdateStatus::Failed(v3::updates::Failed {
+                            from: v3::updates::Processing {
+                                from: v3::updates::Enqueued {
+                                    update_id: enqueued.update_id,
+                                    meta: update_from_unchecked_update_meta(enqueued.meta),
+                                    enqueued_at: enqueued.enqueued_at,
+                                },
+                                started_processing_at: OffsetDateTime::now_utc(),
+                            },
+                            msg: e.to_string(),
+                            code: v3::Code::MalformedDump,
+                            failed_at: OffsetDateTime::now_utc(),
+                        })
+                    }
+                }
+            }
+            v2::updates::UpdateStatus::Processed(processed) => {
+                v3::updates::UpdateStatus::Processed(v3::updates::Processed {
+                    success: processed.success.into(),
+                    processed_at: processed.processed_at,
+                    from: v3::updates::Processing {
+                        from: v3::updates::Enqueued {
+                            update_id: processed.from.from.update_id,
+                            // since we're never going to read the content_file again it's ok to generate a fake one.
+                            meta: update_from_unchecked_update_meta(processed.from.from.meta),
+                            enqueued_at: processed.from.from.enqueued_at,
+                        },
+                        started_processing_at: processed.from.started_processing_at,
+                    },
+                })
+            }
+            v2::updates::UpdateStatus::Aborted(aborted) => {
+                v3::updates::UpdateStatus::Aborted(v3::updates::Aborted {
+                    from: v3::updates::Enqueued {
+                        update_id: aborted.from.update_id,
+                        // since we're never going to read the content_file again it's ok to generate a fake one.
+                        meta: update_from_unchecked_update_meta(aborted.from.meta),
+                        enqueued_at: aborted.from.enqueued_at,
+                    },
+                    aborted_at: aborted.aborted_at,
+                })
+            }
+            v2::updates::UpdateStatus::Failed(failed) => {
+                v3::updates::UpdateStatus::Failed(v3::updates::Failed {
+                    from: v3::updates::Processing {
+                        from: v3::updates::Enqueued {
+                            update_id: failed.from.from.update_id,
+                            // since we're never going to read the content_file again it's ok to generate a fake one.
+                            meta: update_from_unchecked_update_meta(failed.from.from.meta),
+                            enqueued_at: failed.from.from.enqueued_at,
+                        },
+                        started_processing_at: failed.from.started_processing_at,
+                    },
+                    msg: failed.error.message,
+                    code: failed.error.error_code.into(),
+                    failed_at: failed.failed_at,
+                })
+            }
+        }
+    }
+}
+
+impl TryFrom<(v2::updates::UpdateMeta, Option<Uuid>)> for v3::updates::Update {
+    type Error = crate::Error;
+
+    fn try_from((update, uuid): (v2::updates::UpdateMeta, Option<Uuid>)) -> Result<Self> {
+        Ok(match update {
+            v2::updates::UpdateMeta::DocumentsAddition { method, format: _, primary_key }
+                if uuid.is_some() =>
+            {
+                v3::updates::Update::DocumentAddition {
+                    primary_key,
+                    method: match method {
+                        v2::updates::IndexDocumentsMethod::ReplaceDocuments => {
+                            v3::updates::IndexDocumentsMethod::ReplaceDocuments
+                        }
+                        v2::updates::IndexDocumentsMethod::UpdateDocuments => {
+                            v3::updates::IndexDocumentsMethod::UpdateDocuments
+                        }
+                    },
+                    content_uuid: uuid.unwrap(),
+                }
+            }
+            v2::updates::UpdateMeta::DocumentsAddition { .. } => {
+                return Err(crate::Error::MalformedTask)
+            }
+            v2::updates::UpdateMeta::ClearDocuments => v3::updates::Update::ClearDocuments,
+            v2::updates::UpdateMeta::DeleteDocuments { ids } => {
+                v3::updates::Update::DeleteDocuments(ids)
+            }
+            v2::updates::UpdateMeta::Settings(settings) => {
+                v3::updates::Update::Settings(settings.into())
+            }
+        })
+    }
+}
+
+pub fn update_from_unchecked_update_meta(update: v2::updates::UpdateMeta) -> v3::updates::Update {
+    match update {
+        v2::updates::UpdateMeta::DocumentsAddition { method, format: _, primary_key } => {
+            v3::updates::Update::DocumentAddition {
+                primary_key,
+                method: match method {
+                    v2::updates::IndexDocumentsMethod::ReplaceDocuments => {
+                        v3::updates::IndexDocumentsMethod::ReplaceDocuments
+                    }
+                    v2::updates::IndexDocumentsMethod::UpdateDocuments => {
+                        v3::updates::IndexDocumentsMethod::UpdateDocuments
+                    }
+                },
+                // we use this special uuid so we can recognize it if one day there is a bug related to this field.
+                content_uuid: Uuid::from_str("00112233-4455-6677-8899-aabbccddeeff").unwrap(),
+            }
+        }
+        v2::updates::UpdateMeta::ClearDocuments => v3::updates::Update::ClearDocuments,
+        v2::updates::UpdateMeta::DeleteDocuments { ids } => {
+            v3::updates::Update::DeleteDocuments(ids)
+        }
+        v2::updates::UpdateMeta::Settings(settings) => {
+            v3::updates::Update::Settings(settings.into())
+        }
+    }
+}
+
+impl From<v2::updates::UpdateResult> for v3::updates::UpdateResult {
+    fn from(result: v2::updates::UpdateResult) -> Self {
+        match result {
+            v2::updates::UpdateResult::DocumentsAddition(addition) => {
+                v3::updates::UpdateResult::DocumentsAddition(v3::updates::DocumentAdditionResult {
+                    nb_documents: addition.nb_documents,
+                })
+            }
+            v2::updates::UpdateResult::DocumentDeletion { deleted } => {
+                v3::updates::UpdateResult::DocumentDeletion { deleted }
+            }
+            v2::updates::UpdateResult::Other => v3::updates::UpdateResult::Other,
+        }
+    }
+}
+
+impl From<String> for v3::Code {
+    fn from(code: String) -> Self {
+        match code.as_ref() {
+            "create_index" => v3::Code::CreateIndex,
+            "index_already_exists" => v3::Code::IndexAlreadyExists,
+            "index_not_found" => v3::Code::IndexNotFound,
+            "invalid_index_uid" => v3::Code::InvalidIndexUid,
+            "invalid_state" => v3::Code::InvalidState,
+            "missing_primary_key" => v3::Code::MissingPrimaryKey,
+            "primary_key_already_present" => v3::Code::PrimaryKeyAlreadyPresent,
+            "max_fields_limit_exceeded" => v3::Code::MaxFieldsLimitExceeded,
+            "missing_document_id" => v3::Code::MissingDocumentId,
+            "invalid_document_id" => v3::Code::InvalidDocumentId,
+            "filter" => v3::Code::Filter,
+            "sort" => v3::Code::Sort,
+            "bad_parameter" => v3::Code::BadParameter,
+            "bad_request" => v3::Code::BadRequest,
+            "database_size_limit_reached" => v3::Code::DatabaseSizeLimitReached,
+            "document_not_found" => v3::Code::DocumentNotFound,
+            "internal" => v3::Code::Internal,
+            "invalid_geo_field" => v3::Code::InvalidGeoField,
+            "invalid_ranking_rule" => v3::Code::InvalidRankingRule,
+            "invalid_store" => v3::Code::InvalidStore,
+            "invalid_token" => v3::Code::InvalidToken,
+            "missing_authorization_header" => v3::Code::MissingAuthorizationHeader,
+            "no_space_left_on_device" => v3::Code::NoSpaceLeftOnDevice,
+            "dump_not_found" => v3::Code::DumpNotFound,
+            "task_not_found" => v3::Code::TaskNotFound,
+            "payload_too_large" => v3::Code::PayloadTooLarge,
+            "retrieve_document" => v3::Code::RetrieveDocument,
+            "search_documents" => v3::Code::SearchDocuments,
+            "unsupported_media_type" => v3::Code::UnsupportedMediaType,
+            "dump_already_in_progress" => v3::Code::DumpAlreadyInProgress,
+            "dump_process_failed" => v3::Code::DumpProcessFailed,
+            "invalid_content_type" => v3::Code::InvalidContentType,
+            "missing_content_type" => v3::Code::MissingContentType,
+            "malformed_payload" => v3::Code::MalformedPayload,
+            "missing_payload" => v3::Code::MissingPayload,
+            other => {
+                log::warn!("Unknown error code {}", other);
+                v3::Code::UnretrievableErrorCode
+            }
+        }
+    }
+}
+
+impl<A> From<v2::Setting<A>> for v3::Setting<A> {
+    fn from(setting: v2::Setting<A>) -> Self {
+        match setting {
+            v2::settings::Setting::Set(a) => v3::settings::Setting::Set(a),
+            v2::settings::Setting::Reset => v3::settings::Setting::Reset,
+            v2::settings::Setting::NotSet => v3::settings::Setting::NotSet,
+        }
+    }
+}
+
+impl<T> From<v2::Settings<T>> for v3::Settings<v3::Unchecked> {
+    fn from(settings: v2::Settings<T>) -> Self {
+        v3::Settings {
+            displayed_attributes: settings.displayed_attributes.into(),
+            searchable_attributes: settings.searchable_attributes.into(),
+            filterable_attributes: settings.filterable_attributes.into(),
+            sortable_attributes: settings.sortable_attributes.into(),
+            ranking_rules: v3::Setting::from(settings.ranking_rules).map(|criteria| {
+                criteria.into_iter().map(|criterion| patch_ranking_rules(&criterion)).collect()
+            }),
+            stop_words: settings.stop_words.into(),
+            synonyms: settings.synonyms.into(),
+            distinct_attribute: settings.distinct_attribute.into(),
+            _kind: std::marker::PhantomData,
+        }
+    }
+}
+
+fn patch_ranking_rules(ranking_rule: &str) -> String {
+    match v2::settings::Criterion::from_str(ranking_rule) {
+        Ok(v2::settings::Criterion::Words) => String::from("words"),
+        Ok(v2::settings::Criterion::Typo) => String::from("typo"),
+        Ok(v2::settings::Criterion::Proximity) => String::from("proximity"),
+        Ok(v2::settings::Criterion::Attribute) => String::from("attribute"),
+        Ok(v2::settings::Criterion::Sort) => String::from("sort"),
+        Ok(v2::settings::Criterion::Exactness) => String::from("exactness"),
+        Ok(v2::settings::Criterion::Asc(name)) => format!("{name}:asc"),
+        Ok(v2::settings::Criterion::Desc(name)) => format!("{name}:desc"),
+        // we want to forward the error to the current version of meilisearch
+        Err(_) => ranking_rule.to_string(),
+    }
+}
+
+#[cfg(test)]
+pub(crate) mod test {
+    use std::fs::File;
+    use std::io::BufReader;
+
+    use flate2::bufread::GzDecoder;
+    use meili_snap::insta;
+    use tempfile::TempDir;
+
+    use super::*;
+
+    #[test]
+    fn compat_v2_v3() {
+        let dump = File::open("tests/assets/v2.dump").unwrap();
+        let dir = TempDir::new().unwrap();
+        let mut dump = BufReader::new(dump);
+        let gz = GzDecoder::new(&mut dump);
+        let mut archive = tar::Archive::new(gz);
+        archive.unpack(dir.path()).unwrap();
+
+        let mut dump = v2::V2Reader::open(dir).unwrap().to_v3();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2022-10-09 20:27:59.904096267 +00:00:00");
+
+        // tasks
+        let tasks = dump.tasks().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, mut update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"9507711db47c7171c79bc6d57d0bed79");
+        assert_eq!(update_files.len(), 9);
+        assert!(update_files[0].is_some()); // the enqueued document addition
+        assert!(update_files[1..].iter().all(|u| u.is_none())); // everything already processed
+
+        let update_file = update_files.remove(0).unwrap().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(update_file), @"7b8889539b669c7b9ddba448bafa385d");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies2 = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"548284a84de510f71e88e6cdea495cf5");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 110);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"d153b5a81d8b3cdcbe1dec270b574022");
+
+        // movies2
+        insta::assert_json_snapshot!(movies2.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies_2",
+          "primaryKey": null,
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies2.settings().unwrap());
+        let documents = movies2.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 0);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"d751713988987e9331980363e24189ce");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+}

dump/src/reader/compat/v3_to_v4.rs

@@ -0,0 +1,449 @@
+use super::v2_to_v3::{CompatIndexV2ToV3, CompatV2ToV3};
+use super::v4_to_v5::CompatV4ToV5;
+use crate::reader::{v3, v4, UpdateFile};
+use crate::Result;
+
+pub enum CompatV3ToV4 {
+    V3(v3::V3Reader),
+    Compat(CompatV2ToV3),
+}
+
+impl CompatV3ToV4 {
+    pub fn new(v3: v3::V3Reader) -> CompatV3ToV4 {
+        CompatV3ToV4::V3(v3)
+    }
+
+    pub fn to_v5(self) -> CompatV4ToV5 {
+        CompatV4ToV5::Compat(self)
+    }
+
+    pub fn version(&self) -> crate::Version {
+        match self {
+            CompatV3ToV4::V3(v3) => v3.version(),
+            CompatV3ToV4::Compat(compat) => compat.version(),
+        }
+    }
+
+    pub fn date(&self) -> Option<time::OffsetDateTime> {
+        match self {
+            CompatV3ToV4::V3(v3) => v3.date(),
+            CompatV3ToV4::Compat(compat) => compat.date(),
+        }
+    }
+
+    pub fn instance_uid(&self) -> Result<Option<uuid::Uuid>> {
+        Ok(None)
+    }
+
+    pub fn indexes(&self) -> Result<impl Iterator<Item = Result<CompatIndexV3ToV4>> + '_> {
+        Ok(match self {
+            CompatV3ToV4::V3(v3) => {
+                Box::new(v3.indexes()?.map(|index| index.map(CompatIndexV3ToV4::from)))
+                    as Box<dyn Iterator<Item = Result<CompatIndexV3ToV4>> + '_>
+            }
+
+            CompatV3ToV4::Compat(compat) => {
+                Box::new(compat.indexes()?.map(|index| index.map(CompatIndexV3ToV4::from)))
+                    as Box<dyn Iterator<Item = Result<CompatIndexV3ToV4>> + '_>
+            }
+        })
+    }
+
+    pub fn tasks(
+        &mut self,
+    ) -> Box<dyn Iterator<Item = Result<(v4::Task, Option<Box<UpdateFile>>)>> + '_> {
+        let indexes = match self {
+            CompatV3ToV4::V3(v3) => v3.index_uuid(),
+            CompatV3ToV4::Compat(compat) => compat.index_uuid(),
+        };
+        let tasks = match self {
+            CompatV3ToV4::V3(v3) => v3.tasks(),
+            CompatV3ToV4::Compat(compat) => compat.tasks(),
+        };
+
+        Box::new(
+            tasks
+                // we need to override the old task ids that were generated
+                // by index in favor of a global unique incremental ID.
+                .enumerate()
+                .map(move |(task_id, task)| {
+                    task.map(|(task, content_file)| {
+                        let index_uid = indexes
+                            .iter()
+                            .find(|index| index.uuid == task.uuid)
+                            .map(|index| index.uid.clone());
+
+                        let index_uid = match index_uid {
+                            Some(uid) => uid,
+                            None => {
+                                log::warn!(
+                                    "Error while importing the update {}.",
+                                    task.update.id()
+                                );
+                                log::warn!(
+                                    "The index associated to the uuid `{}` could not be retrieved.",
+                                    task.uuid.to_string()
+                                );
+                                if task.update.is_finished() {
+                                    // we're fucking with his history but not his data, that's ok-ish.
+                                    log::warn!("The index-uuid will be set as `unknown`.");
+                                    String::from("unknown")
+                                } else {
+                                    log::warn!("The task will be ignored.");
+                                    return None;
+                                }
+                            }
+                        };
+
+                        let task = v4::Task {
+                            id: task_id as u32,
+                            index_uid: v4::meta::IndexUid(index_uid),
+                            content: match task.update.meta() {
+                                v3::Kind::DeleteDocuments(documents) => {
+                                    v4::tasks::TaskContent::DocumentDeletion(
+                                        v4::tasks::DocumentDeletion::Ids(documents.clone()),
+                                    )
+                                }
+                                v3::Kind::DocumentAddition {
+                                    primary_key,
+                                    method,
+                                    content_uuid,
+                                } => v4::tasks::TaskContent::DocumentAddition {
+                                    merge_strategy: match method {
+                                        v3::updates::IndexDocumentsMethod::ReplaceDocuments => {
+                                            v4::tasks::IndexDocumentsMethod::ReplaceDocuments
+                                        }
+                                        v3::updates::IndexDocumentsMethod::UpdateDocuments => {
+                                            v4::tasks::IndexDocumentsMethod::UpdateDocuments
+                                        }
+                                    },
+                                    primary_key: primary_key.clone(),
+                                    documents_count: 0, // we don't have this info
+                                    allow_index_creation: true, // there was no API-key in the v3
+                                    content_uuid: *content_uuid,
+                                },
+                                v3::Kind::Settings(settings) => {
+                                    v4::tasks::TaskContent::SettingsUpdate {
+                                        settings: v4::Settings::from(settings.clone()),
+                                        is_deletion: false, // that didn't exist at this time
+                                        allow_index_creation: true, // there was no API-key in the v3
+                                    }
+                                }
+                                v3::Kind::ClearDocuments => {
+                                    v4::tasks::TaskContent::DocumentDeletion(
+                                        v4::tasks::DocumentDeletion::Clear,
+                                    )
+                                }
+                            },
+                            events: match task.update {
+                                v3::Status::Processing(processing) => {
+                                    vec![v4::tasks::TaskEvent::Created(processing.from.enqueued_at)]
+                                }
+                                v3::Status::Enqueued(enqueued) => {
+                                    vec![v4::tasks::TaskEvent::Created(enqueued.enqueued_at)]
+                                }
+                                v3::Status::Processed(processed) => {
+                                    vec![
+                                        v4::tasks::TaskEvent::Created(
+                                            processed.from.from.enqueued_at,
+                                        ),
+                                        v4::tasks::TaskEvent::Processing(
+                                            processed.from.started_processing_at,
+                                        ),
+                                        v4::tasks::TaskEvent::Succeded {
+                                            result: match processed.success {
+                                                v3::updates::UpdateResult::DocumentsAddition(
+                                                    document_addition,
+                                                ) => v4::tasks::TaskResult::DocumentAddition {
+                                                    indexed_documents: document_addition
+                                                        .nb_documents
+                                                        as u64,
+                                                },
+                                                v3::updates::UpdateResult::DocumentDeletion {
+                                                    deleted,
+                                                } => v4::tasks::TaskResult::DocumentDeletion {
+                                                    deleted_documents: deleted,
+                                                },
+                                                v3::updates::UpdateResult::Other => {
+                                                    v4::tasks::TaskResult::Other
+                                                }
+                                            },
+                                            timestamp: processed.processed_at,
+                                        },
+                                    ]
+                                }
+                                v3::Status::Failed(failed) => vec![
+                                    v4::tasks::TaskEvent::Created(failed.from.from.enqueued_at),
+                                    v4::tasks::TaskEvent::Processing(
+                                        failed.from.started_processing_at,
+                                    ),
+                                    v4::tasks::TaskEvent::Failed {
+                                        error: v4::ResponseError::from_msg(
+                                            failed.msg.to_string(),
+                                            failed.code.into(),
+                                        ),
+                                        timestamp: failed.failed_at,
+                                    },
+                                ],
+                                v3::Status::Aborted(aborted) => vec![
+                            v4::tasks::TaskEvent::Created(aborted.from.enqueued_at),
+                            v4::tasks::TaskEvent::Failed {
+                                error: v4::ResponseError::from_msg(
+                                    "Task was aborted in a previous version of meilisearch."
+                                        .to_string(),
+                                    v4::errors::Code::UnretrievableErrorCode,
+                                ),
+                                timestamp: aborted.aborted_at,
+                            },
+                        ],
+                            },
+                        };
+
+                        Some((task, content_file))
+                    })
+                })
+                .filter_map(|res| res.transpose()),
+        )
+    }
+
+    pub fn keys(&mut self) -> Box<dyn Iterator<Item = Result<v4::Key>> + '_> {
+        Box::new(std::iter::empty())
+    }
+}
+
+pub enum CompatIndexV3ToV4 {
+    V3(v3::V3IndexReader),
+    Compat(CompatIndexV2ToV3),
+}
+
+impl From<v3::V3IndexReader> for CompatIndexV3ToV4 {
+    fn from(index_reader: v3::V3IndexReader) -> Self {
+        Self::V3(index_reader)
+    }
+}
+
+impl From<CompatIndexV2ToV3> for CompatIndexV3ToV4 {
+    fn from(index_reader: CompatIndexV2ToV3) -> Self {
+        Self::Compat(index_reader)
+    }
+}
+
+impl CompatIndexV3ToV4 {
+    pub fn new(v3: v3::V3IndexReader) -> CompatIndexV3ToV4 {
+        CompatIndexV3ToV4::V3(v3)
+    }
+
+    pub fn metadata(&self) -> &crate::IndexMetadata {
+        match self {
+            CompatIndexV3ToV4::V3(v3) => v3.metadata(),
+            CompatIndexV3ToV4::Compat(compat) => compat.metadata(),
+        }
+    }
+
+    pub fn documents(&mut self) -> Result<Box<dyn Iterator<Item = Result<v4::Document>> + '_>> {
+        match self {
+            CompatIndexV3ToV4::V3(v3) => v3
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<v4::Document>> + '_>),
+
+            CompatIndexV3ToV4::Compat(compat) => compat
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<v4::Document>> + '_>),
+        }
+    }
+
+    pub fn settings(&mut self) -> Result<v4::Settings<v4::Checked>> {
+        Ok(match self {
+            CompatIndexV3ToV4::V3(v3) => {
+                v4::Settings::<v4::Unchecked>::from(v3.settings()?).check()
+            }
+            CompatIndexV3ToV4::Compat(compat) => {
+                v4::Settings::<v4::Unchecked>::from(compat.settings()?).check()
+            }
+        })
+    }
+}
+
+impl<T> From<v3::Setting<T>> for v4::Setting<T> {
+    fn from(setting: v3::Setting<T>) -> Self {
+        match setting {
+            v3::Setting::Set(t) => v4::Setting::Set(t),
+            v3::Setting::Reset => v4::Setting::Reset,
+            v3::Setting::NotSet => v4::Setting::NotSet,
+        }
+    }
+}
+
+impl From<v3::Code> for v4::Code {
+    fn from(code: v3::Code) -> Self {
+        match code {
+            v3::Code::CreateIndex => v4::Code::CreateIndex,
+            v3::Code::IndexAlreadyExists => v4::Code::IndexAlreadyExists,
+            v3::Code::IndexNotFound => v4::Code::IndexNotFound,
+            v3::Code::InvalidIndexUid => v4::Code::InvalidIndexUid,
+            v3::Code::InvalidState => v4::Code::InvalidState,
+            v3::Code::MissingPrimaryKey => v4::Code::MissingPrimaryKey,
+            v3::Code::PrimaryKeyAlreadyPresent => v4::Code::PrimaryKeyAlreadyPresent,
+            v3::Code::MaxFieldsLimitExceeded => v4::Code::MaxFieldsLimitExceeded,
+            v3::Code::MissingDocumentId => v4::Code::MissingDocumentId,
+            v3::Code::InvalidDocumentId => v4::Code::InvalidDocumentId,
+            v3::Code::Filter => v4::Code::Filter,
+            v3::Code::Sort => v4::Code::Sort,
+            v3::Code::BadParameter => v4::Code::BadParameter,
+            v3::Code::BadRequest => v4::Code::BadRequest,
+            v3::Code::DatabaseSizeLimitReached => v4::Code::DatabaseSizeLimitReached,
+            v3::Code::DocumentNotFound => v4::Code::DocumentNotFound,
+            v3::Code::Internal => v4::Code::Internal,
+            v3::Code::InvalidGeoField => v4::Code::InvalidGeoField,
+            v3::Code::InvalidRankingRule => v4::Code::InvalidRankingRule,
+            v3::Code::InvalidStore => v4::Code::InvalidStore,
+            v3::Code::InvalidToken => v4::Code::InvalidToken,
+            v3::Code::MissingAuthorizationHeader => v4::Code::MissingAuthorizationHeader,
+            v3::Code::NoSpaceLeftOnDevice => v4::Code::NoSpaceLeftOnDevice,
+            v3::Code::DumpNotFound => v4::Code::DumpNotFound,
+            v3::Code::TaskNotFound => v4::Code::TaskNotFound,
+            v3::Code::PayloadTooLarge => v4::Code::PayloadTooLarge,
+            v3::Code::RetrieveDocument => v4::Code::RetrieveDocument,
+            v3::Code::SearchDocuments => v4::Code::SearchDocuments,
+            v3::Code::UnsupportedMediaType => v4::Code::UnsupportedMediaType,
+            v3::Code::DumpAlreadyInProgress => v4::Code::DumpAlreadyInProgress,
+            v3::Code::DumpProcessFailed => v4::Code::DumpProcessFailed,
+            v3::Code::InvalidContentType => v4::Code::InvalidContentType,
+            v3::Code::MissingContentType => v4::Code::MissingContentType,
+            v3::Code::MalformedPayload => v4::Code::MalformedPayload,
+            v3::Code::MissingPayload => v4::Code::MissingPayload,
+            v3::Code::UnretrievableErrorCode => v4::Code::UnretrievableErrorCode,
+            v3::Code::MalformedDump => v4::Code::MalformedDump,
+        }
+    }
+}
+
+impl<T> From<v3::Settings<T>> for v4::Settings<v4::Unchecked> {
+    fn from(settings: v3::Settings<T>) -> Self {
+        v4::Settings {
+            displayed_attributes: settings.displayed_attributes.into(),
+            searchable_attributes: settings.searchable_attributes.into(),
+            filterable_attributes: settings.filterable_attributes.into(),
+            sortable_attributes: settings.sortable_attributes.into(),
+            ranking_rules: settings.ranking_rules.into(),
+            stop_words: settings.stop_words.into(),
+            synonyms: settings.synonyms.into(),
+            distinct_attribute: settings.distinct_attribute.into(),
+            typo_tolerance: v4::Setting::NotSet,
+            _kind: std::marker::PhantomData,
+        }
+    }
+}
+
+#[cfg(test)]
+pub(crate) mod test {
+    use std::fs::File;
+    use std::io::BufReader;
+
+    use flate2::bufread::GzDecoder;
+    use meili_snap::insta;
+    use tempfile::TempDir;
+
+    use super::*;
+
+    #[test]
+    fn compat_v3_v4() {
+        let dump = File::open("tests/assets/v3.dump").unwrap();
+        let dir = TempDir::new().unwrap();
+        let mut dump = BufReader::new(dump);
+        let gz = GzDecoder::new(&mut dump);
+        let mut archive = tar::Archive::new(gz);
+        archive.unpack(dir.path()).unwrap();
+
+        let mut dump = v3::V3Reader::open(dir).unwrap().to_v4();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2022-10-07 11:39:03.709153554 +00:00:00");
+
+        // tasks
+        let tasks = dump.tasks().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, mut update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"79bc053583a1a7172bbaaafb1edaeb78");
+        assert_eq!(update_files.len(), 10);
+        assert!(update_files[0].is_some()); // the enqueued document addition
+        assert!(update_files[1..].iter().all(|u| u.is_none())); // everything already processed
+
+        let update_file = update_files.remove(0).unwrap().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(update_file), @"7b8889539b669c7b9ddba448bafa385d");
+
+        // keys
+        let keys = dump.keys().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(keys, { "[].uid" => "[uuid]" }), @"d751713988987e9331980363e24189ce");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies2 = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"548284a84de510f71e88e6cdea495cf5");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 110);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"d153b5a81d8b3cdcbe1dec270b574022");
+
+        // movies2
+        insta::assert_json_snapshot!(movies2.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies_2",
+          "primaryKey": null,
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies2.settings().unwrap());
+        let documents = movies2.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 0);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"d751713988987e9331980363e24189ce");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+}

dump/src/reader/compat/v4_to_v5.rs

@@ -0,0 +1,467 @@
+use super::v3_to_v4::{CompatIndexV3ToV4, CompatV3ToV4};
+use super::v5_to_v6::CompatV5ToV6;
+use crate::reader::{v4, v5, Document};
+use crate::Result;
+
+pub enum CompatV4ToV5 {
+    V4(v4::V4Reader),
+    Compat(CompatV3ToV4),
+}
+
+impl CompatV4ToV5 {
+    pub fn new(v4: v4::V4Reader) -> CompatV4ToV5 {
+        CompatV4ToV5::V4(v4)
+    }
+
+    pub fn to_v6(self) -> CompatV5ToV6 {
+        CompatV5ToV6::Compat(self)
+    }
+
+    pub fn version(&self) -> crate::Version {
+        match self {
+            CompatV4ToV5::V4(v4) => v4.version(),
+            CompatV4ToV5::Compat(compat) => compat.version(),
+        }
+    }
+
+    pub fn date(&self) -> Option<time::OffsetDateTime> {
+        match self {
+            CompatV4ToV5::V4(v4) => v4.date(),
+            CompatV4ToV5::Compat(compat) => compat.date(),
+        }
+    }
+
+    pub fn instance_uid(&self) -> Result<Option<uuid::Uuid>> {
+        match self {
+            CompatV4ToV5::V4(v4) => v4.instance_uid(),
+            CompatV4ToV5::Compat(compat) => compat.instance_uid(),
+        }
+    }
+
+    pub fn indexes(&self) -> Result<Box<dyn Iterator<Item = Result<CompatIndexV4ToV5>> + '_>> {
+        Ok(match self {
+            CompatV4ToV5::V4(v4) => {
+                Box::new(v4.indexes()?.map(|index| index.map(CompatIndexV4ToV5::from)))
+                    as Box<dyn Iterator<Item = Result<CompatIndexV4ToV5>> + '_>
+            }
+
+            CompatV4ToV5::Compat(compat) => {
+                Box::new(compat.indexes()?.map(|index| index.map(CompatIndexV4ToV5::from)))
+                    as Box<dyn Iterator<Item = Result<CompatIndexV4ToV5>> + '_>
+            }
+        })
+    }
+
+    pub fn tasks(
+        &mut self,
+    ) -> Box<dyn Iterator<Item = Result<(v5::Task, Option<Box<crate::reader::UpdateFile>>)>> + '_>
+    {
+        let tasks = match self {
+            CompatV4ToV5::V4(v4) => v4.tasks(),
+            CompatV4ToV5::Compat(compat) => compat.tasks(),
+        };
+        Box::new(tasks.map(|task| {
+            task.map(|(task, content_file)| {
+                let task = v5::Task {
+                    id: task.id,
+                    content: match task.content {
+                        v4::tasks::TaskContent::DocumentAddition {
+                            content_uuid,
+                            merge_strategy,
+                            primary_key,
+                            documents_count,
+                            allow_index_creation,
+                        } => v5::tasks::TaskContent::DocumentAddition {
+                            index_uid: v5::meta::IndexUid(task.index_uid.0),
+                            content_uuid,
+                            merge_strategy: match merge_strategy {
+                                v4::tasks::IndexDocumentsMethod::ReplaceDocuments => {
+                                    v5::tasks::IndexDocumentsMethod::ReplaceDocuments
+                                }
+                                v4::tasks::IndexDocumentsMethod::UpdateDocuments => {
+                                    v5::tasks::IndexDocumentsMethod::UpdateDocuments
+                                }
+                            },
+                            primary_key,
+                            documents_count,
+                            allow_index_creation,
+                        },
+                        v4::tasks::TaskContent::DocumentDeletion(deletion) => {
+                            v5::tasks::TaskContent::DocumentDeletion {
+                                index_uid: v5::meta::IndexUid(task.index_uid.0),
+                                deletion: match deletion {
+                                    v4::tasks::DocumentDeletion::Clear => {
+                                        v5::tasks::DocumentDeletion::Clear
+                                    }
+                                    v4::tasks::DocumentDeletion::Ids(ids) => {
+                                        v5::tasks::DocumentDeletion::Ids(ids)
+                                    }
+                                },
+                            }
+                        }
+                        v4::tasks::TaskContent::SettingsUpdate {
+                            settings,
+                            is_deletion,
+                            allow_index_creation,
+                        } => v5::tasks::TaskContent::SettingsUpdate {
+                            index_uid: v5::meta::IndexUid(task.index_uid.0),
+                            settings: settings.into(),
+                            is_deletion,
+                            allow_index_creation,
+                        },
+                        v4::tasks::TaskContent::IndexDeletion => {
+                            v5::tasks::TaskContent::IndexDeletion {
+                                index_uid: v5::meta::IndexUid(task.index_uid.0),
+                            }
+                        }
+                        v4::tasks::TaskContent::IndexCreation { primary_key } => {
+                            v5::tasks::TaskContent::IndexCreation {
+                                index_uid: v5::meta::IndexUid(task.index_uid.0),
+                                primary_key,
+                            }
+                        }
+                        v4::tasks::TaskContent::IndexUpdate { primary_key } => {
+                            v5::tasks::TaskContent::IndexUpdate {
+                                index_uid: v5::meta::IndexUid(task.index_uid.0),
+                                primary_key,
+                            }
+                        }
+                    },
+                    events: task
+                        .events
+                        .into_iter()
+                        .map(|event| match event {
+                            v4::tasks::TaskEvent::Created(date) => {
+                                v5::tasks::TaskEvent::Created(date)
+                            }
+                            v4::tasks::TaskEvent::Batched { timestamp, batch_id } => {
+                                v5::tasks::TaskEvent::Batched { timestamp, batch_id }
+                            }
+                            v4::tasks::TaskEvent::Processing(date) => {
+                                v5::tasks::TaskEvent::Processing(date)
+                            }
+                            v4::tasks::TaskEvent::Succeded { result, timestamp } => {
+                                v5::tasks::TaskEvent::Succeeded {
+                                    result: match result {
+                                        v4::tasks::TaskResult::DocumentAddition {
+                                            indexed_documents,
+                                        } => v5::tasks::TaskResult::DocumentAddition {
+                                            indexed_documents,
+                                        },
+                                        v4::tasks::TaskResult::DocumentDeletion {
+                                            deleted_documents,
+                                        } => v5::tasks::TaskResult::DocumentDeletion {
+                                            deleted_documents,
+                                        },
+                                        v4::tasks::TaskResult::ClearAll { deleted_documents } => {
+                                            v5::tasks::TaskResult::ClearAll { deleted_documents }
+                                        }
+                                        v4::tasks::TaskResult::Other => {
+                                            v5::tasks::TaskResult::Other
+                                        }
+                                    },
+                                    timestamp,
+                                }
+                            }
+                            v4::tasks::TaskEvent::Failed { error, timestamp } => {
+                                v5::tasks::TaskEvent::Failed {
+                                    error: v5::ResponseError::from(error),
+                                    timestamp,
+                                }
+                            }
+                        })
+                        .collect(),
+                };
+
+                (task, content_file)
+            })
+        }))
+    }
+
+    pub fn keys(&mut self) -> Box<dyn Iterator<Item = Result<v5::Key>> + '_> {
+        let keys = match self {
+            CompatV4ToV5::V4(v4) => v4.keys(),
+            CompatV4ToV5::Compat(compat) => compat.keys(),
+        };
+        Box::new(keys.map(|key| {
+            key.map(|key| v5::Key {
+                description: key.description,
+                name: None,
+                uid: v5::keys::KeyId::new_v4(),
+                actions: key.actions.into_iter().filter_map(|action| action.into()).collect(),
+                indexes: key
+                    .indexes
+                    .into_iter()
+                    .map(|index| match index.as_str() {
+                        "*" => v5::StarOr::Star,
+                        _ => v5::StarOr::Other(v5::meta::IndexUid(index)),
+                    })
+                    .collect(),
+                expires_at: key.expires_at,
+                created_at: key.created_at,
+                updated_at: key.updated_at,
+            })
+        }))
+    }
+}
+
+pub enum CompatIndexV4ToV5 {
+    V4(v4::V4IndexReader),
+    Compat(CompatIndexV3ToV4),
+}
+
+impl From<v4::V4IndexReader> for CompatIndexV4ToV5 {
+    fn from(index_reader: v4::V4IndexReader) -> Self {
+        Self::V4(index_reader)
+    }
+}
+
+impl From<CompatIndexV3ToV4> for CompatIndexV4ToV5 {
+    fn from(index_reader: CompatIndexV3ToV4) -> Self {
+        Self::Compat(index_reader)
+    }
+}
+
+impl CompatIndexV4ToV5 {
+    pub fn metadata(&self) -> &crate::IndexMetadata {
+        match self {
+            CompatIndexV4ToV5::V4(v4) => v4.metadata(),
+            CompatIndexV4ToV5::Compat(compat) => compat.metadata(),
+        }
+    }
+
+    pub fn documents(&mut self) -> Result<Box<dyn Iterator<Item = Result<Document>> + '_>> {
+        match self {
+            CompatIndexV4ToV5::V4(v4) => v4
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<Document>> + '_>),
+            CompatIndexV4ToV5::Compat(compat) => compat
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<Document>> + '_>),
+        }
+    }
+
+    pub fn settings(&mut self) -> Result<v5::Settings<v5::Checked>> {
+        match self {
+            CompatIndexV4ToV5::V4(v4) => Ok(v5::Settings::from(v4.settings()?).check()),
+            CompatIndexV4ToV5::Compat(compat) => Ok(v5::Settings::from(compat.settings()?).check()),
+        }
+    }
+}
+
+impl<T> From<v4::Setting<T>> for v5::Setting<T> {
+    fn from(setting: v4::Setting<T>) -> Self {
+        match setting {
+            v4::Setting::Set(t) => v5::Setting::Set(t),
+            v4::Setting::Reset => v5::Setting::Reset,
+            v4::Setting::NotSet => v5::Setting::NotSet,
+        }
+    }
+}
+
+impl From<v4::ResponseError> for v5::ResponseError {
+    fn from(error: v4::ResponseError) -> Self {
+        let code = match error.error_code.as_ref() {
+            "index_creation_failed" => v5::Code::CreateIndex,
+            "index_already_exists" => v5::Code::IndexAlreadyExists,
+            "index_not_found" => v5::Code::IndexNotFound,
+            "invalid_index_uid" => v5::Code::InvalidIndexUid,
+            "invalid_min_word_length_for_typo" => v5::Code::InvalidMinWordLengthForTypo,
+            "invalid_state" => v5::Code::InvalidState,
+            "primary_key_inference_failed" => v5::Code::MissingPrimaryKey,
+            "index_primary_key_already_exists" => v5::Code::PrimaryKeyAlreadyPresent,
+            "max_fields_limit_exceeded" => v5::Code::MaxFieldsLimitExceeded,
+            "missing_document_id" => v5::Code::MissingDocumentId,
+            "invalid_document_id" => v5::Code::InvalidDocumentId,
+            "invalid_filter" => v5::Code::Filter,
+            "invalid_sort" => v5::Code::Sort,
+            "bad_parameter" => v5::Code::BadParameter,
+            "bad_request" => v5::Code::BadRequest,
+            "database_size_limit_reached" => v5::Code::DatabaseSizeLimitReached,
+            "document_not_found" => v5::Code::DocumentNotFound,
+            "internal" => v5::Code::Internal,
+            "invalid_geo_field" => v5::Code::InvalidGeoField,
+            "invalid_ranking_rule" => v5::Code::InvalidRankingRule,
+            "invalid_store_file" => v5::Code::InvalidStore,
+            "invalid_api_key" => v5::Code::InvalidToken,
+            "missing_authorization_header" => v5::Code::MissingAuthorizationHeader,
+            "no_space_left_on_device" => v5::Code::NoSpaceLeftOnDevice,
+            "dump_not_found" => v5::Code::DumpNotFound,
+            "task_not_found" => v5::Code::TaskNotFound,
+            "payload_too_large" => v5::Code::PayloadTooLarge,
+            "unretrievable_document" => v5::Code::RetrieveDocument,
+            "search_error" => v5::Code::SearchDocuments,
+            "unsupported_media_type" => v5::Code::UnsupportedMediaType,
+            "dump_already_processing" => v5::Code::DumpAlreadyInProgress,
+            "dump_process_failed" => v5::Code::DumpProcessFailed,
+            "invalid_content_type" => v5::Code::InvalidContentType,
+            "missing_content_type" => v5::Code::MissingContentType,
+            "malformed_payload" => v5::Code::MalformedPayload,
+            "missing_payload" => v5::Code::MissingPayload,
+            "api_key_not_found" => v5::Code::ApiKeyNotFound,
+            "missing_parameter" => v5::Code::MissingParameter,
+            "invalid_api_key_actions" => v5::Code::InvalidApiKeyActions,
+            "invalid_api_key_indexes" => v5::Code::InvalidApiKeyIndexes,
+            "invalid_api_key_expires_at" => v5::Code::InvalidApiKeyExpiresAt,
+            "invalid_api_key_description" => v5::Code::InvalidApiKeyDescription,
+            other => {
+                log::warn!("Unknown error code {}", other);
+                v5::Code::UnretrievableErrorCode
+            }
+        };
+        v5::ResponseError::from_msg(error.message, code)
+    }
+}
+
+impl<T> From<v4::Settings<T>> for v5::Settings<v5::Unchecked> {
+    fn from(settings: v4::Settings<T>) -> Self {
+        v5::Settings {
+            displayed_attributes: settings.displayed_attributes.into(),
+            searchable_attributes: settings.searchable_attributes.into(),
+            filterable_attributes: settings.filterable_attributes.into(),
+            sortable_attributes: settings.sortable_attributes.into(),
+            ranking_rules: settings.ranking_rules.into(),
+            stop_words: settings.stop_words.into(),
+            synonyms: settings.synonyms.into(),
+            distinct_attribute: settings.distinct_attribute.into(),
+            typo_tolerance: match settings.typo_tolerance {
+                v4::Setting::Set(typo) => v5::Setting::Set(v5::TypoTolerance {
+                    enabled: typo.enabled.into(),
+                    min_word_size_for_typos: match typo.min_word_size_for_typos {
+                        v4::Setting::Set(t) => v5::Setting::Set(v5::MinWordSizeForTypos {
+                            one_typo: t.one_typo.into(),
+                            two_typos: t.two_typos.into(),
+                        }),
+                        v4::Setting::Reset => v5::Setting::Reset,
+                        v4::Setting::NotSet => v5::Setting::NotSet,
+                    },
+                    disable_on_words: typo.disable_on_words.into(),
+                    disable_on_attributes: typo.disable_on_attributes.into(),
+                }),
+                v4::Setting::Reset => v5::Setting::Reset,
+                v4::Setting::NotSet => v5::Setting::NotSet,
+            },
+            faceting: v5::Setting::NotSet,
+            pagination: v5::Setting::NotSet,
+            _kind: std::marker::PhantomData,
+        }
+    }
+}
+
+impl From<v4::Action> for Option<v5::Action> {
+    fn from(key: v4::Action) -> Self {
+        match key {
+            v4::Action::All => Some(v5::Action::All),
+            v4::Action::Search => Some(v5::Action::Search),
+            v4::Action::DocumentsAdd => Some(v5::Action::DocumentsAdd),
+            v4::Action::DocumentsGet => Some(v5::Action::DocumentsGet),
+            v4::Action::DocumentsDelete => Some(v5::Action::DocumentsDelete),
+            v4::Action::IndexesAdd => Some(v5::Action::IndexesAdd),
+            v4::Action::IndexesGet => Some(v5::Action::IndexesGet),
+            v4::Action::IndexesUpdate => Some(v5::Action::IndexesUpdate),
+            v4::Action::IndexesDelete => Some(v5::Action::IndexesDelete),
+            v4::Action::TasksGet => Some(v5::Action::TasksGet),
+            v4::Action::SettingsGet => Some(v5::Action::SettingsGet),
+            v4::Action::SettingsUpdate => Some(v5::Action::SettingsUpdate),
+            v4::Action::StatsGet => Some(v5::Action::StatsGet),
+            v4::Action::DumpsCreate => Some(v5::Action::DumpsCreate),
+            v4::Action::DumpsGet => None,
+            v4::Action::Version => Some(v5::Action::Version),
+        }
+    }
+}
+
+#[cfg(test)]
+pub(crate) mod test {
+    use std::fs::File;
+    use std::io::BufReader;
+
+    use flate2::bufread::GzDecoder;
+    use meili_snap::insta;
+    use tempfile::TempDir;
+
+    use super::*;
+
+    #[test]
+    fn compat_v4_v5() {
+        let dump = File::open("tests/assets/v4.dump").unwrap();
+        let dir = TempDir::new().unwrap();
+        let mut dump = BufReader::new(dump);
+        let gz = GzDecoder::new(&mut dump);
+        let mut archive = tar::Archive::new(gz);
+        archive.unpack(dir.path()).unwrap();
+
+        let mut dump = v4::V4Reader::open(dir).unwrap().to_v5();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2022-10-06 12:53:49.131989609 +00:00:00");
+        insta::assert_display_snapshot!(dump.instance_uid().unwrap().unwrap(), @"9e15e977-f2ae-4761-943f-1eaf75fd736d");
+
+        // tasks
+        let tasks = dump.tasks().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"ed9a30cded4c046ef46f7cff7450347e");
+        assert_eq!(update_files.len(), 10);
+        assert!(update_files[0].is_some()); // the enqueued document addition
+        assert!(update_files[1..].iter().all(|u| u.is_none())); // everything already processed
+
+        // keys
+        let keys = dump.keys().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(keys, { "[].uid" => "[uuid]" }), @"1384361d734fd77c23804c9696228660");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"b01c8371aea4c7171af0d4d846a2bdca");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 110);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"786022a66ecb992c8a2a60fee070a5ab");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+}

dump/src/reader/compat/v5_to_v6.rs

@@ -0,0 +1,507 @@
+use std::str::FromStr;
+
+use super::v4_to_v5::{CompatIndexV4ToV5, CompatV4ToV5};
+use crate::reader::{v5, v6, Document, UpdateFile};
+use crate::Result;
+
+pub enum CompatV5ToV6 {
+    V5(v5::V5Reader),
+    Compat(CompatV4ToV5),
+}
+
+impl CompatV5ToV6 {
+    pub fn new_v5(v5: v5::V5Reader) -> CompatV5ToV6 {
+        CompatV5ToV6::V5(v5)
+    }
+
+    pub fn version(&self) -> crate::Version {
+        match self {
+            CompatV5ToV6::V5(v5) => v5.version(),
+            CompatV5ToV6::Compat(compat) => compat.version(),
+        }
+    }
+
+    pub fn date(&self) -> Option<time::OffsetDateTime> {
+        match self {
+            CompatV5ToV6::V5(v5) => v5.date(),
+            CompatV5ToV6::Compat(compat) => compat.date(),
+        }
+    }
+
+    pub fn instance_uid(&self) -> Result<Option<uuid::Uuid>> {
+        match self {
+            CompatV5ToV6::V5(v5) => v5.instance_uid(),
+            CompatV5ToV6::Compat(compat) => compat.instance_uid(),
+        }
+    }
+
+    pub fn indexes(&self) -> Result<Box<dyn Iterator<Item = Result<CompatIndexV5ToV6>> + '_>> {
+        let indexes = match self {
+            CompatV5ToV6::V5(v5) => {
+                Box::new(v5.indexes()?.map(|index| index.map(CompatIndexV5ToV6::from)))
+                    as Box<dyn Iterator<Item = Result<CompatIndexV5ToV6>> + '_>
+            }
+
+            CompatV5ToV6::Compat(compat) => {
+                Box::new(compat.indexes()?.map(|index| index.map(CompatIndexV5ToV6::from)))
+                    as Box<dyn Iterator<Item = Result<CompatIndexV5ToV6>> + '_>
+            }
+        };
+        Ok(indexes)
+    }
+
+    pub fn tasks(
+        &mut self,
+    ) -> Result<Box<dyn Iterator<Item = Result<(v6::Task, Option<Box<UpdateFile>>)>> + '_>> {
+        let instance_uid = self.instance_uid().ok().flatten();
+        let keys = self.keys()?.collect::<Result<Vec<_>>>()?;
+
+        let tasks = match self {
+            CompatV5ToV6::V5(v5) => v5.tasks(),
+            CompatV5ToV6::Compat(compat) => compat.tasks(),
+        };
+        Ok(Box::new(tasks.map(move |task| {
+            task.map(|(task, content_file)| {
+                let mut task_view: v5::tasks::TaskView = task.clone().into();
+
+                if task_view.status == v5::Status::Processing {
+                    task_view.started_at = None;
+                }
+
+                let task = v6::Task {
+                    uid: task_view.uid,
+                    index_uid: task_view.index_uid,
+                    status: match task_view.status {
+                        v5::Status::Enqueued => v6::Status::Enqueued,
+                        v5::Status::Processing => v6::Status::Enqueued,
+                        v5::Status::Succeeded => v6::Status::Succeeded,
+                        v5::Status::Failed => v6::Status::Failed,
+                    },
+                    kind: match task.content {
+                        v5::tasks::TaskContent::IndexCreation { primary_key, .. } => {
+                            v6::Kind::IndexCreation { primary_key }
+                        }
+                        v5::tasks::TaskContent::IndexUpdate { primary_key, .. } => {
+                            v6::Kind::IndexUpdate { primary_key }
+                        }
+                        v5::tasks::TaskContent::IndexDeletion { .. } => v6::Kind::IndexDeletion,
+                        v5::tasks::TaskContent::DocumentAddition {
+                            merge_strategy,
+                            allow_index_creation,
+                            primary_key,
+                            documents_count,
+                            ..
+                        } => v6::Kind::DocumentImport {
+                            primary_key,
+                            documents_count: documents_count as u64,
+                            method: match merge_strategy {
+                                v5::tasks::IndexDocumentsMethod::ReplaceDocuments => {
+                                    v6::milli::update::IndexDocumentsMethod::ReplaceDocuments
+                                }
+                                v5::tasks::IndexDocumentsMethod::UpdateDocuments => {
+                                    v6::milli::update::IndexDocumentsMethod::UpdateDocuments
+                                }
+                            },
+                            allow_index_creation,
+                        },
+                        v5::tasks::TaskContent::DocumentDeletion { deletion, .. } => match deletion
+                        {
+                            v5::tasks::DocumentDeletion::Clear => v6::Kind::DocumentClear,
+                            v5::tasks::DocumentDeletion::Ids(documents_ids) => {
+                                v6::Kind::DocumentDeletion { documents_ids }
+                            }
+                        },
+                        v5::tasks::TaskContent::SettingsUpdate {
+                            allow_index_creation,
+                            is_deletion,
+                            settings,
+                            ..
+                        } => v6::Kind::Settings {
+                            is_deletion,
+                            allow_index_creation,
+                            settings: Box::new(settings.into()),
+                        },
+                        v5::tasks::TaskContent::Dump { uid: _ } => {
+                            // in v6 we compute the dump_uid from the started_at processing time
+                            v6::Kind::DumpCreation { keys: keys.clone(), instance_uid }
+                        }
+                    },
+                    canceled_by: None,
+                    details: task_view.details.map(|details| match details {
+                        v5::Details::DocumentAddition { received_documents, indexed_documents } => {
+                            v6::Details::DocumentAdditionOrUpdate {
+                                received_documents: received_documents as u64,
+                                indexed_documents,
+                            }
+                        }
+                        v5::Details::Settings { settings } => {
+                            v6::Details::SettingsUpdate { settings: Box::new(settings.into()) }
+                        }
+                        v5::Details::IndexInfo { primary_key } => {
+                            v6::Details::IndexInfo { primary_key }
+                        }
+                        v5::Details::DocumentDeletion {
+                            received_document_ids,
+                            deleted_documents,
+                        } => v6::Details::DocumentDeletion {
+                            provided_ids: received_document_ids,
+                            deleted_documents,
+                        },
+                        v5::Details::ClearAll { deleted_documents } => {
+                            v6::Details::ClearAll { deleted_documents }
+                        }
+                        v5::Details::Dump { dump_uid } => {
+                            v6::Details::Dump { dump_uid: Some(dump_uid) }
+                        }
+                    }),
+                    error: task_view.error.map(|e| e.into()),
+                    enqueued_at: task_view.enqueued_at,
+                    started_at: task_view.started_at,
+                    finished_at: task_view.finished_at,
+                };
+
+                (task, content_file)
+            })
+        })))
+    }
+
+    pub fn keys(&mut self) -> Result<Box<dyn Iterator<Item = Result<v6::Key>> + '_>> {
+        let keys = match self {
+            CompatV5ToV6::V5(v5) => v5.keys()?,
+            CompatV5ToV6::Compat(compat) => compat.keys(),
+        };
+
+        Ok(Box::new(keys.map(|key| {
+            key.map(|key| v6::Key {
+                description: key.description,
+                name: key.name,
+                uid: key.uid,
+                actions: key.actions.into_iter().map(|action| action.into()).collect(),
+                indexes: key
+                    .indexes
+                    .into_iter()
+                    .map(|index| match index {
+                        v5::StarOr::Star => v6::StarOr::Star,
+                        v5::StarOr::Other(uid) => {
+                            v6::StarOr::Other(v6::IndexUid::new_unchecked(uid.as_str()))
+                        }
+                    })
+                    .collect(),
+                expires_at: key.expires_at,
+                created_at: key.created_at,
+                updated_at: key.updated_at,
+            })
+        })))
+    }
+}
+
+pub enum CompatIndexV5ToV6 {
+    V5(v5::V5IndexReader),
+    Compat(CompatIndexV4ToV5),
+}
+
+impl From<v5::V5IndexReader> for CompatIndexV5ToV6 {
+    fn from(index_reader: v5::V5IndexReader) -> Self {
+        Self::V5(index_reader)
+    }
+}
+
+impl From<CompatIndexV4ToV5> for CompatIndexV5ToV6 {
+    fn from(index_reader: CompatIndexV4ToV5) -> Self {
+        Self::Compat(index_reader)
+    }
+}
+
+impl CompatIndexV5ToV6 {
+    pub fn new_v5(v5: v5::V5IndexReader) -> CompatIndexV5ToV6 {
+        CompatIndexV5ToV6::V5(v5)
+    }
+
+    pub fn metadata(&self) -> &crate::IndexMetadata {
+        match self {
+            CompatIndexV5ToV6::V5(v5) => v5.metadata(),
+            CompatIndexV5ToV6::Compat(compat) => compat.metadata(),
+        }
+    }
+
+    pub fn documents(&mut self) -> Result<Box<dyn Iterator<Item = Result<Document>> + '_>> {
+        match self {
+            CompatIndexV5ToV6::V5(v5) => v5
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<Document>> + '_>),
+            CompatIndexV5ToV6::Compat(compat) => compat
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<Document>> + '_>),
+        }
+    }
+
+    pub fn settings(&mut self) -> Result<v6::Settings<v6::Checked>> {
+        match self {
+            CompatIndexV5ToV6::V5(v5) => Ok(v6::Settings::from(v5.settings()?).check()),
+            CompatIndexV5ToV6::Compat(compat) => Ok(v6::Settings::from(compat.settings()?).check()),
+        }
+    }
+}
+
+impl<T> From<v5::Setting<T>> for v6::Setting<T> {
+    fn from(setting: v5::Setting<T>) -> Self {
+        match setting {
+            v5::Setting::Set(t) => v6::Setting::Set(t),
+            v5::Setting::Reset => v6::Setting::Reset,
+            v5::Setting::NotSet => v6::Setting::NotSet,
+        }
+    }
+}
+
+impl From<v5::ResponseError> for v6::ResponseError {
+    fn from(error: v5::ResponseError) -> Self {
+        let code = match error.error_code.as_ref() {
+            "index_creation_failed" => v6::Code::IndexCreationFailed,
+            "index_already_exists" => v6::Code::IndexAlreadyExists,
+            "index_not_found" => v6::Code::IndexNotFound,
+            "invalid_index_uid" => v6::Code::InvalidIndexUid,
+            "invalid_min_word_length_for_typo" => v6::Code::InvalidSettingsTypoTolerance,
+            "invalid_state" => v6::Code::InvalidState,
+            "primary_key_inference_failed" => v6::Code::IndexPrimaryKeyNoCandidateFound,
+            "index_primary_key_already_exists" => v6::Code::IndexPrimaryKeyAlreadyExists,
+            "max_fields_limit_exceeded" => v6::Code::MaxFieldsLimitExceeded,
+            "missing_document_id" => v6::Code::MissingDocumentId,
+            "invalid_document_id" => v6::Code::InvalidDocumentId,
+            "invalid_filter" => v6::Code::InvalidSettingsFilterableAttributes,
+            "invalid_sort" => v6::Code::InvalidSettingsSortableAttributes,
+            "bad_parameter" => v6::Code::BadParameter,
+            "bad_request" => v6::Code::BadRequest,
+            "database_size_limit_reached" => v6::Code::DatabaseSizeLimitReached,
+            "document_not_found" => v6::Code::DocumentNotFound,
+            "internal" => v6::Code::Internal,
+            "invalid_geo_field" => v6::Code::InvalidDocumentGeoField,
+            "invalid_ranking_rule" => v6::Code::InvalidSettingsRankingRules,
+            "invalid_store_file" => v6::Code::InvalidStoreFile,
+            "invalid_api_key" => v6::Code::InvalidApiKey,
+            "missing_authorization_header" => v6::Code::MissingAuthorizationHeader,
+            "no_space_left_on_device" => v6::Code::NoSpaceLeftOnDevice,
+            "dump_not_found" => v6::Code::DumpNotFound,
+            "task_not_found" => v6::Code::TaskNotFound,
+            "payload_too_large" => v6::Code::PayloadTooLarge,
+            "unretrievable_document" => v6::Code::UnretrievableDocument,
+            "unsupported_media_type" => v6::Code::UnsupportedMediaType,
+            "dump_already_processing" => v6::Code::DumpAlreadyProcessing,
+            "dump_process_failed" => v6::Code::DumpProcessFailed,
+            "invalid_content_type" => v6::Code::InvalidContentType,
+            "missing_content_type" => v6::Code::MissingContentType,
+            "malformed_payload" => v6::Code::MalformedPayload,
+            "missing_payload" => v6::Code::MissingPayload,
+            "api_key_not_found" => v6::Code::ApiKeyNotFound,
+            "missing_parameter" => v6::Code::BadRequest,
+            "invalid_api_key_actions" => v6::Code::InvalidApiKeyActions,
+            "invalid_api_key_indexes" => v6::Code::InvalidApiKeyIndexes,
+            "invalid_api_key_expires_at" => v6::Code::InvalidApiKeyExpiresAt,
+            "invalid_api_key_description" => v6::Code::InvalidApiKeyDescription,
+            "invalid_api_key_name" => v6::Code::InvalidApiKeyName,
+            "invalid_api_key_uid" => v6::Code::InvalidApiKeyUid,
+            "immutable_field" => v6::Code::BadRequest,
+            "api_key_already_exists" => v6::Code::ApiKeyAlreadyExists,
+            other => {
+                log::warn!("Unknown error code {}", other);
+                v6::Code::UnretrievableErrorCode
+            }
+        };
+        v6::ResponseError::from_msg(error.message, code)
+    }
+}
+
+impl<T> From<v5::Settings<T>> for v6::Settings<v6::Unchecked> {
+    fn from(settings: v5::Settings<T>) -> Self {
+        v6::Settings {
+            displayed_attributes: settings.displayed_attributes.into(),
+            searchable_attributes: settings.searchable_attributes.into(),
+            filterable_attributes: settings.filterable_attributes.into(),
+            sortable_attributes: settings.sortable_attributes.into(),
+            ranking_rules: {
+                match settings.ranking_rules {
+                    v5::settings::Setting::Set(ranking_rules) => {
+                        let mut new_ranking_rules = vec![];
+                        for rule in ranking_rules {
+                            match v6::RankingRuleView::from_str(&rule) {
+                                Ok(new_rule) => {
+                                    new_ranking_rules.push(new_rule);
+                                }
+                                Err(_) => {
+                                    log::warn!("Error while importing settings. The ranking rule `{rule}` does not exist anymore.")
+                                }
+                            }
+                        }
+                        v6::Setting::Set(new_ranking_rules)
+                    }
+                    v5::settings::Setting::Reset => v6::Setting::Reset,
+                    v5::settings::Setting::NotSet => v6::Setting::NotSet,
+                }
+            },
+            stop_words: settings.stop_words.into(),
+            synonyms: settings.synonyms.into(),
+            distinct_attribute: settings.distinct_attribute.into(),
+            typo_tolerance: match settings.typo_tolerance {
+                v5::Setting::Set(typo) => v6::Setting::Set(v6::TypoTolerance {
+                    enabled: typo.enabled.into(),
+                    min_word_size_for_typos: match typo.min_word_size_for_typos {
+                        v5::Setting::Set(t) => v6::Setting::Set(v6::MinWordSizeForTypos {
+                            one_typo: t.one_typo.into(),
+                            two_typos: t.two_typos.into(),
+                        }),
+                        v5::Setting::Reset => v6::Setting::Reset,
+                        v5::Setting::NotSet => v6::Setting::NotSet,
+                    },
+                    disable_on_words: typo.disable_on_words.into(),
+                    disable_on_attributes: typo.disable_on_attributes.into(),
+                }),
+                v5::Setting::Reset => v6::Setting::Reset,
+                v5::Setting::NotSet => v6::Setting::NotSet,
+            },
+            faceting: match settings.faceting {
+                v5::Setting::Set(faceting) => v6::Setting::Set(v6::FacetingSettings {
+                    max_values_per_facet: faceting.max_values_per_facet.into(),
+                }),
+                v5::Setting::Reset => v6::Setting::Reset,
+                v5::Setting::NotSet => v6::Setting::NotSet,
+            },
+            pagination: match settings.pagination {
+                v5::Setting::Set(pagination) => v6::Setting::Set(v6::PaginationSettings {
+                    max_total_hits: pagination.max_total_hits.into(),
+                }),
+                v5::Setting::Reset => v6::Setting::Reset,
+                v5::Setting::NotSet => v6::Setting::NotSet,
+            },
+            _kind: std::marker::PhantomData,
+        }
+    }
+}
+
+impl From<v5::Action> for v6::Action {
+    fn from(key: v5::Action) -> Self {
+        match key {
+            v5::Action::All => v6::Action::All,
+            v5::Action::Search => v6::Action::Search,
+            v5::Action::DocumentsAll => v6::Action::DocumentsAll,
+            v5::Action::DocumentsAdd => v6::Action::DocumentsAdd,
+            v5::Action::DocumentsGet => v6::Action::DocumentsGet,
+            v5::Action::DocumentsDelete => v6::Action::DocumentsDelete,
+            v5::Action::IndexesAll => v6::Action::IndexesAll,
+            v5::Action::IndexesAdd => v6::Action::IndexesAdd,
+            v5::Action::IndexesGet => v6::Action::IndexesGet,
+            v5::Action::IndexesUpdate => v6::Action::IndexesUpdate,
+            v5::Action::IndexesDelete => v6::Action::IndexesDelete,
+            v5::Action::TasksAll => v6::Action::TasksAll,
+            v5::Action::TasksGet => v6::Action::TasksGet,
+            v5::Action::SettingsAll => v6::Action::SettingsAll,
+            v5::Action::SettingsGet => v6::Action::SettingsGet,
+            v5::Action::SettingsUpdate => v6::Action::SettingsUpdate,
+            v5::Action::StatsAll => v6::Action::StatsAll,
+            v5::Action::StatsGet => v6::Action::StatsGet,
+            v5::Action::MetricsAll => v6::Action::MetricsAll,
+            v5::Action::MetricsGet => v6::Action::MetricsGet,
+            v5::Action::DumpsAll => v6::Action::DumpsAll,
+            v5::Action::DumpsCreate => v6::Action::DumpsCreate,
+            v5::Action::Version => v6::Action::Version,
+            v5::Action::KeysAdd => v6::Action::KeysAdd,
+            v5::Action::KeysGet => v6::Action::KeysGet,
+            v5::Action::KeysUpdate => v6::Action::KeysUpdate,
+            v5::Action::KeysDelete => v6::Action::KeysDelete,
+        }
+    }
+}
+
+#[cfg(test)]
+pub(crate) mod test {
+    use std::fs::File;
+    use std::io::BufReader;
+
+    use flate2::bufread::GzDecoder;
+    use meili_snap::insta;
+    use tempfile::TempDir;
+
+    use super::*;
+
+    #[test]
+    fn compat_v5_v6() {
+        let dump = File::open("tests/assets/v5.dump").unwrap();
+        let dir = TempDir::new().unwrap();
+        let mut dump = BufReader::new(dump);
+        let gz = GzDecoder::new(&mut dump);
+        let mut archive = tar::Archive::new(gz);
+        archive.unpack(dir.path()).unwrap();
+
+        let mut dump = v5::V5Reader::open(dir).unwrap().to_v6();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2022-10-04 15:55:10.344982459 +00:00:00");
+        insta::assert_display_snapshot!(dump.instance_uid().unwrap().unwrap(), @"9e15e977-f2ae-4761-943f-1eaf75fd736d");
+
+        // tasks
+        let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"41f91d3a94911b2735ec41b07540df5c");
+        assert_eq!(update_files.len(), 22);
+        assert!(update_files[0].is_none()); // the dump creation
+        assert!(update_files[1].is_some()); // the enqueued document addition
+        assert!(update_files[2..].iter().all(|u| u.is_none())); // everything already processed
+
+        // keys
+        let keys = dump.keys().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(keys), @"c9d2b467fe2fca0b35580d8a999808fb");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"b01c8371aea4c7171af0d4d846a2bdca");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 200);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"e962baafd2fbae4cdd14e876053b0c5a");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+}

dump/src/reader/mod.rs

@@ -0,0 +1,685 @@
+use std::fs::File;
+use std::io::{BufReader, Read};
+
+use flate2::bufread::GzDecoder;
+use serde::Deserialize;
+use tempfile::TempDir;
+
+use self::compat::v4_to_v5::CompatV4ToV5;
+use self::compat::v5_to_v6::{CompatIndexV5ToV6, CompatV5ToV6};
+use self::v5::V5Reader;
+use self::v6::{V6IndexReader, V6Reader};
+use crate::{Result, Version};
+
+mod compat;
+
+pub(self) mod v1;
+pub(self) mod v2;
+pub(self) mod v3;
+pub(self) mod v4;
+pub(self) mod v5;
+pub(self) mod v6;
+
+pub type Document = serde_json::Map<String, serde_json::Value>;
+pub type UpdateFile = dyn Iterator<Item = Result<Document>>;
+
+pub enum DumpReader {
+    Current(V6Reader),
+    Compat(CompatV5ToV6),
+}
+
+impl DumpReader {
+    pub fn open(dump: impl Read) -> Result<DumpReader> {
+        let path = TempDir::new()?;
+        let mut dump = BufReader::new(dump);
+        let gz = GzDecoder::new(&mut dump);
+        let mut archive = tar::Archive::new(gz);
+        archive.unpack(path.path())?;
+
+        #[derive(Deserialize)]
+        #[serde(rename_all = "camelCase")]
+        struct MetadataVersion {
+            pub dump_version: Version,
+        }
+        let mut meta_file = File::open(path.path().join("metadata.json"))?;
+        let MetadataVersion { dump_version } = serde_json::from_reader(&mut meta_file)?;
+
+        match dump_version {
+            Version::V1 => {
+                Ok(v1::V1Reader::open(path)?.to_v2().to_v3().to_v4().to_v5().to_v6().into())
+            }
+            Version::V2 => Ok(v2::V2Reader::open(path)?.to_v3().to_v4().to_v5().to_v6().into()),
+            Version::V3 => Ok(v3::V3Reader::open(path)?.to_v4().to_v5().to_v6().into()),
+            Version::V4 => Ok(v4::V4Reader::open(path)?.to_v5().to_v6().into()),
+            Version::V5 => Ok(v5::V5Reader::open(path)?.to_v6().into()),
+            Version::V6 => Ok(v6::V6Reader::open(path)?.into()),
+        }
+    }
+
+    pub fn version(&self) -> crate::Version {
+        match self {
+            DumpReader::Current(current) => current.version(),
+            DumpReader::Compat(compat) => compat.version(),
+        }
+    }
+
+    pub fn date(&self) -> Option<time::OffsetDateTime> {
+        match self {
+            DumpReader::Current(current) => current.date(),
+            DumpReader::Compat(compat) => compat.date(),
+        }
+    }
+
+    pub fn instance_uid(&self) -> Result<Option<uuid::Uuid>> {
+        match self {
+            DumpReader::Current(current) => current.instance_uid(),
+            DumpReader::Compat(compat) => compat.instance_uid(),
+        }
+    }
+
+    pub fn indexes(&self) -> Result<Box<dyn Iterator<Item = Result<DumpIndexReader>> + '_>> {
+        match self {
+            DumpReader::Current(current) => {
+                let indexes = Box::new(current.indexes()?.map(|res| res.map(DumpIndexReader::from)))
+                    as Box<dyn Iterator<Item = Result<DumpIndexReader>> + '_>;
+                Ok(indexes)
+            }
+            DumpReader::Compat(compat) => {
+                let indexes = Box::new(compat.indexes()?.map(|res| res.map(DumpIndexReader::from)))
+                    as Box<dyn Iterator<Item = Result<DumpIndexReader>> + '_>;
+                Ok(indexes)
+            }
+        }
+    }
+
+    pub fn tasks(
+        &mut self,
+    ) -> Result<Box<dyn Iterator<Item = Result<(v6::Task, Option<Box<UpdateFile>>)>> + '_>> {
+        match self {
+            DumpReader::Current(current) => Ok(current.tasks()),
+            DumpReader::Compat(compat) => compat.tasks(),
+        }
+    }
+
+    pub fn keys(&mut self) -> Result<Box<dyn Iterator<Item = Result<v6::Key>> + '_>> {
+        match self {
+            DumpReader::Current(current) => Ok(current.keys()),
+            DumpReader::Compat(compat) => compat.keys(),
+        }
+    }
+}
+
+impl From<V6Reader> for DumpReader {
+    fn from(value: V6Reader) -> Self {
+        DumpReader::Current(value)
+    }
+}
+
+impl From<CompatV5ToV6> for DumpReader {
+    fn from(value: CompatV5ToV6) -> Self {
+        DumpReader::Compat(value)
+    }
+}
+
+impl From<V5Reader> for DumpReader {
+    fn from(value: V5Reader) -> Self {
+        DumpReader::Compat(value.to_v6())
+    }
+}
+
+impl From<CompatV4ToV5> for DumpReader {
+    fn from(value: CompatV4ToV5) -> Self {
+        DumpReader::Compat(value.to_v6())
+    }
+}
+
+pub enum DumpIndexReader {
+    Current(v6::V6IndexReader),
+    Compat(Box<CompatIndexV5ToV6>),
+}
+
+impl DumpIndexReader {
+    pub fn new_v6(v6: v6::V6IndexReader) -> DumpIndexReader {
+        DumpIndexReader::Current(v6)
+    }
+
+    pub fn metadata(&self) -> &crate::IndexMetadata {
+        match self {
+            DumpIndexReader::Current(v6) => v6.metadata(),
+            DumpIndexReader::Compat(compat) => compat.metadata(),
+        }
+    }
+
+    pub fn documents(&mut self) -> Result<Box<dyn Iterator<Item = Result<Document>> + '_>> {
+        match self {
+            DumpIndexReader::Current(v6) => v6
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<Document>> + '_>),
+            DumpIndexReader::Compat(compat) => compat
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<Document>> + '_>),
+        }
+    }
+
+    pub fn settings(&mut self) -> Result<v6::Settings<v6::Checked>> {
+        match self {
+            DumpIndexReader::Current(v6) => v6.settings(),
+            DumpIndexReader::Compat(compat) => compat.settings(),
+        }
+    }
+}
+
+impl From<V6IndexReader> for DumpIndexReader {
+    fn from(value: V6IndexReader) -> Self {
+        DumpIndexReader::Current(value)
+    }
+}
+
+impl From<CompatIndexV5ToV6> for DumpIndexReader {
+    fn from(value: CompatIndexV5ToV6) -> Self {
+        DumpIndexReader::Compat(Box::new(value))
+    }
+}
+
+#[cfg(test)]
+pub(crate) mod test {
+    use std::fs::File;
+
+    use meili_snap::insta;
+
+    use super::*;
+
+    #[test]
+    fn import_dump_v5() {
+        let dump = File::open("tests/assets/v5.dump").unwrap();
+        let mut dump = DumpReader::open(dump).unwrap();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2022-10-04 15:55:10.344982459 +00:00:00");
+        insta::assert_display_snapshot!(dump.instance_uid().unwrap().unwrap(), @"9e15e977-f2ae-4761-943f-1eaf75fd736d");
+
+        // tasks
+        let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"41f91d3a94911b2735ec41b07540df5c");
+        assert_eq!(update_files.len(), 22);
+        assert!(update_files[0].is_none()); // the dump creation
+        assert!(update_files[1].is_some()); // the enqueued document addition
+        assert!(update_files[2..].iter().all(|u| u.is_none())); // everything already processed
+
+        // keys
+        let keys = dump.keys().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(keys), @"c9d2b467fe2fca0b35580d8a999808fb");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "2022-10-04T15:51:35.939396731Z",
+          "updatedAt": "2022-10-04T15:55:01.897325373Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"b01c8371aea4c7171af0d4d846a2bdca");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "2022-10-04T15:51:35.291992167Z",
+          "updatedAt": "2022-10-04T15:55:10.33561842Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 200);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"e962baafd2fbae4cdd14e876053b0c5a");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "2022-10-04T15:51:37.381094632Z",
+          "updatedAt": "2022-10-04T15:55:02.394503431Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+
+    #[test]
+    fn import_dump_v4() {
+        let dump = File::open("tests/assets/v4.dump").unwrap();
+        let mut dump = DumpReader::open(dump).unwrap();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2022-10-06 12:53:49.131989609 +00:00:00");
+        insta::assert_display_snapshot!(dump.instance_uid().unwrap().unwrap(), @"9e15e977-f2ae-4761-943f-1eaf75fd736d");
+
+        // tasks
+        let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"c2445ddd1785528b80f2ba534d3bd00c");
+        assert_eq!(update_files.len(), 10);
+        assert!(update_files[0].is_some()); // the enqueued document addition
+        assert!(update_files[1..].iter().all(|u| u.is_none())); // everything already processed
+
+        // keys
+        let keys = dump.keys().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(keys, { "[].uid" => "[uuid]" }), @"d751713988987e9331980363e24189ce");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "2022-10-06T12:53:39.360187055Z",
+          "updatedAt": "2022-10-06T12:53:40.603035979Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"b01c8371aea4c7171af0d4d846a2bdca");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "2022-10-06T12:53:38.710611568Z",
+          "updatedAt": "2022-10-06T12:53:49.785862546Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 110);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"786022a66ecb992c8a2a60fee070a5ab");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "2022-10-06T12:53:40.831649057Z",
+          "updatedAt": "2022-10-06T12:53:41.116036186Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+
+    #[test]
+    fn import_dump_v3() {
+        let dump = File::open("tests/assets/v3.dump").unwrap();
+        let mut dump = DumpReader::open(dump).unwrap();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2022-10-07 11:39:03.709153554 +00:00:00");
+        assert_eq!(dump.instance_uid().unwrap(), None);
+
+        // tasks
+        let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"cd12efd308fe3ed226356a727ab42ed3");
+        assert_eq!(update_files.len(), 10);
+        assert!(update_files[0].is_some()); // the enqueued document addition
+        assert!(update_files[1..].iter().all(|u| u.is_none())); // everything already processed
+
+        // keys
+        let keys = dump.keys().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(keys), @"d751713988987e9331980363e24189ce");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies2 = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"548284a84de510f71e88e6cdea495cf5");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 110);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"d153b5a81d8b3cdcbe1dec270b574022");
+
+        // movies2
+        insta::assert_json_snapshot!(movies2.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies_2",
+          "primaryKey": null,
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies2.settings().unwrap());
+        let documents = movies2.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 0);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"d751713988987e9331980363e24189ce");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+
+    #[test]
+    fn import_dump_v2() {
+        let dump = File::open("tests/assets/v2.dump").unwrap();
+        let mut dump = DumpReader::open(dump).unwrap();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2022-10-09 20:27:59.904096267 +00:00:00");
+        assert_eq!(dump.instance_uid().unwrap(), None);
+
+        // tasks
+        let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"bc616290adfe7d09a624cf6065ca9069");
+        assert_eq!(update_files.len(), 9);
+        assert!(update_files[0].is_some()); // the enqueued document addition
+        assert!(update_files[1..].iter().all(|u| u.is_none())); // everything already processed
+
+        // keys
+        let keys = dump.keys().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(keys), @"d751713988987e9331980363e24189ce");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies2 = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"548284a84de510f71e88e6cdea495cf5");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 110);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"d153b5a81d8b3cdcbe1dec270b574022");
+
+        // movies2
+        insta::assert_json_snapshot!(movies2.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies_2",
+          "primaryKey": null,
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies2.settings().unwrap());
+        let documents = movies2.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 0);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"d751713988987e9331980363e24189ce");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+
+    #[test]
+    fn import_dump_v2_from_meilisearch_v0_22_0_issue_3435() {
+        let dump = File::open("tests/assets/v2-v0.22.0.dump").unwrap();
+        let mut dump = DumpReader::open(dump).unwrap();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2023-01-30 16:26:09.247261 +00:00:00");
+        assert_eq!(dump.instance_uid().unwrap(), None);
+
+        // tasks
+        let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"2db37756d8af1fb7623436b76e8956a6");
+        assert_eq!(update_files.len(), 8);
+        assert!(update_files[0..].iter().all(|u| u.is_none())); // everything already processed
+
+        // keys
+        let keys = dump.keys().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(keys), @"d751713988987e9331980363e24189ce");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"548284a84de510f71e88e6cdea495cf5");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"0227598af846e574139ee0b80e03a720");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+
+    #[test]
+    fn import_dump_v1() {
+        let dump = File::open("tests/assets/v1.dump").unwrap();
+        let mut dump = DumpReader::open(dump).unwrap();
+
+        // top level infos
+        assert_eq!(dump.date(), None);
+        assert_eq!(dump.instance_uid().unwrap(), None);
+
+        // tasks
+        let tasks = dump.tasks().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"8df6eab075a44b3c1af6b726f9fd9a43");
+        assert_eq!(update_files.len(), 9);
+        assert!(update_files[..].iter().all(|u| u.is_none())); // no update file in dump v1
+
+        // keys
+        let keys = dump.keys().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot!(meili_snap::json_string!(keys), @"[]");
+        meili_snap::snapshot_hash!(meili_snap::json_string!(keys), @"d751713988987e9331980363e24189ce");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "2022-10-02T13:23:39.976870431Z",
+          "updatedAt": "2022-10-02T13:27:54.353262482Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"b01c8371aea4c7171af0d4d846a2bdca");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "2022-10-02T13:15:29.477512777Z",
+          "updatedAt": "2022-10-02T13:21:12.671204856Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"b63dbed5bbc059f3e32bc471ae699bf5");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "2022-10-02T13:38:26.358882984Z",
+          "updatedAt": "2022-10-02T13:38:26.385609433Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"aa24c0cfc733d66c396237ad44263bed");
+    }
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v1-11.snap

@@ -0,0 +1,24 @@
+---
+source: dump/src/reader/mod.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "typo",
+    "words",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v1-5.snap

@@ -0,0 +1,38 @@
+---
+source: dump/src/reader/mod.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "typo",
+    "words",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v1-8.snap

@@ -0,0 +1,31 @@
+---
+source: dump/src/reader/mod.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [
+    "genres",
+    "id"
+  ],
+  "sortableAttributes": [
+    "genres",
+    "id"
+  ],
+  "rankingRules": [
+    "typo",
+    "words",
+    "proximity",
+    "attribute",
+    "exactness",
+    "release_date:asc"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v2-11.snap

@@ -0,0 +1,23 @@
+---
+source: dump/src/reader/mod.rs
+expression: movies2.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v2-14.snap

@@ -0,0 +1,23 @@
+---
+source: dump/src/reader/mod.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v2-5.snap

@@ -0,0 +1,37 @@
+---
+source: dump/src/reader/mod.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v2-8.snap

@@ -0,0 +1,24 @@
+---
+source: dump/src/reader/mod.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "exactness",
+    "release_date:asc"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v2_from_meilisearch_v0_22_0_issue_3435-11.snap

@@ -0,0 +1,25 @@
+---
+source: dump/src/reader/mod.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v2_from_meilisearch_v0_22_0_issue_3435-5.snap

@@ -0,0 +1,39 @@
+---
+source: dump/src/reader/mod.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v2_from_meilisearch_v0_22_0_issue_3435-8.snap

@@ -0,0 +1,30 @@
+---
+source: dump/src/reader/mod.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [
+    "genres",
+    "id"
+  ],
+  "sortableAttributes": [
+    "release_date"
+  ],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "exactness",
+    "release_date:asc"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v3-11.snap

@@ -0,0 +1,25 @@
+---
+source: dump/src/reader/mod.rs
+expression: movies2.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v3-14.snap

@@ -0,0 +1,25 @@
+---
+source: dump/src/reader/mod.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v3-5.snap

@@ -0,0 +1,39 @@
+---
+source: dump/src/reader/mod.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v3-8.snap

@@ -0,0 +1,31 @@
+---
+source: dump/src/reader/mod.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [
+    "genres",
+    "id"
+  ],
+  "sortableAttributes": [
+    "release_date"
+  ],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness",
+    "release_date:asc"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v4-12.snap

@@ -0,0 +1,34 @@
+---
+source: dump/src/reader/mod.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null,
+  "typoTolerance": {
+    "enabled": true,
+    "minWordSizeForTypos": {
+      "oneTypo": 5,
+      "twoTypos": 9
+    },
+    "disableOnWords": [],
+    "disableOnAttributes": []
+  }
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v4-6.snap

@@ -0,0 +1,48 @@
+---
+source: dump/src/reader/mod.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "distinctAttribute": null,
+  "typoTolerance": {
+    "enabled": true,
+    "minWordSizeForTypos": {
+      "oneTypo": 5,
+      "twoTypos": 9
+    },
+    "disableOnWords": [],
+    "disableOnAttributes": []
+  }
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v4-9.snap

@@ -0,0 +1,40 @@
+---
+source: dump/src/reader/mod.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [
+    "genres",
+    "id"
+  ],
+  "sortableAttributes": [
+    "release_date"
+  ],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness",
+    "release_date:asc"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null,
+  "typoTolerance": {
+    "enabled": true,
+    "minWordSizeForTypos": {
+      "oneTypo": 5,
+      "twoTypos": 9
+    },
+    "disableOnWords": [],
+    "disableOnAttributes": []
+  }
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v5-12.snap

@@ -0,0 +1,40 @@
+---
+source: dump/src/reader/mod.rs
+expression: spells.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null,
+  "typoTolerance": {
+    "enabled": true,
+    "minWordSizeForTypos": {
+      "oneTypo": 5,
+      "twoTypos": 9
+    },
+    "disableOnWords": [],
+    "disableOnAttributes": []
+  },
+  "faceting": {
+    "maxValuesPerFacet": 100
+  },
+  "pagination": {
+    "maxTotalHits": 1000
+  }
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v5-6.snap

@@ -0,0 +1,54 @@
+---
+source: dump/src/reader/mod.rs
+expression: products.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "sortableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "distinctAttribute": null,
+  "typoTolerance": {
+    "enabled": true,
+    "minWordSizeForTypos": {
+      "oneTypo": 5,
+      "twoTypos": 9
+    },
+    "disableOnWords": [],
+    "disableOnAttributes": []
+  },
+  "faceting": {
+    "maxValuesPerFacet": 100
+  },
+  "pagination": {
+    "maxTotalHits": 1000
+  }
+}

dump/src/reader/snapshots/dump__reader__test__import_dump_v5-9.snap

@@ -0,0 +1,46 @@
+---
+source: dump/src/reader/mod.rs
+expression: movies.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [
+    "genres",
+    "id"
+  ],
+  "sortableAttributes": [
+    "release_date"
+  ],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "sort",
+    "exactness",
+    "release_date:asc"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null,
+  "typoTolerance": {
+    "enabled": true,
+    "minWordSizeForTypos": {
+      "oneTypo": 5,
+      "twoTypos": 9
+    },
+    "disableOnWords": [],
+    "disableOnAttributes": []
+  },
+  "faceting": {
+    "maxValuesPerFacet": 100
+  },
+  "pagination": {
+    "maxTotalHits": 1000
+  }
+}

dump/src/reader/v1/mod.rs

@@ -0,0 +1,262 @@
+use std::fs::{self, File};
+use std::io::{BufRead, BufReader};
+use std::path::{Path, PathBuf};
+
+use serde::Deserialize;
+use tempfile::TempDir;
+use time::OffsetDateTime;
+
+use super::compat::v1_to_v2::CompatV1ToV2;
+use super::Document;
+use crate::{IndexMetadata, Result, Version};
+
+pub mod settings;
+pub mod update;
+
+pub struct V1Reader {
+    pub dump: TempDir,
+    pub db_version: String,
+    pub dump_version: crate::Version,
+    indexes: Vec<V1Index>,
+}
+
+pub struct IndexUuid {
+    pub name: String,
+    pub uid: String,
+}
+pub type Task = self::update::UpdateStatus;
+
+struct V1Index {
+    metadata: IndexMetadataV1,
+    path: PathBuf,
+}
+
+impl V1Index {
+    pub fn new(path: PathBuf, metadata: Index) -> Self {
+        Self { metadata: metadata.into(), path }
+    }
+
+    pub fn open(&self) -> Result<V1IndexReader> {
+        V1IndexReader::new(&self.path, self.metadata.clone())
+    }
+
+    pub fn metadata(&self) -> &IndexMetadata {
+        &self.metadata.metadata
+    }
+}
+
+pub struct V1IndexReader {
+    metadata: IndexMetadataV1,
+    documents: BufReader<File>,
+    settings: BufReader<File>,
+    updates: BufReader<File>,
+}
+
+impl V1IndexReader {
+    pub fn new(path: &Path, metadata: IndexMetadataV1) -> Result<Self> {
+        Ok(V1IndexReader {
+            metadata,
+            documents: BufReader::new(File::open(path.join("documents.jsonl"))?),
+            settings: BufReader::new(File::open(path.join("settings.json"))?),
+            updates: BufReader::new(File::open(path.join("updates.jsonl"))?),
+        })
+    }
+
+    pub fn metadata(&self) -> &IndexMetadata {
+        &self.metadata.metadata
+    }
+
+    pub fn documents(&mut self) -> Result<impl Iterator<Item = Result<Document>> + '_> {
+        Ok((&mut self.documents)
+            .lines()
+            .map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) }))
+    }
+
+    pub fn settings(&mut self) -> Result<self::settings::Settings> {
+        Ok(serde_json::from_reader(&mut self.settings)?)
+    }
+
+    pub fn tasks(self) -> impl Iterator<Item = Result<Task>> {
+        self.updates.lines().map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) })
+    }
+}
+
+impl V1Reader {
+    pub fn open(dump: TempDir) -> Result<Self> {
+        let meta_file = fs::read(dump.path().join("metadata.json"))?;
+        let metadata: Metadata = serde_json::from_reader(&*meta_file)?;
+
+        let mut indexes = Vec::new();
+
+        for index in metadata.indexes.into_iter() {
+            let index_path = dump.path().join(&index.uid);
+            indexes.push(V1Index::new(index_path, index));
+        }
+
+        Ok(V1Reader {
+            dump,
+            indexes,
+            db_version: metadata.db_version,
+            dump_version: metadata.dump_version,
+        })
+    }
+
+    pub fn to_v2(self) -> CompatV1ToV2 {
+        CompatV1ToV2 { from: self }
+    }
+
+    pub fn index_uuid(&self) -> Vec<IndexUuid> {
+        self.indexes
+            .iter()
+            .map(|index| IndexUuid {
+                name: index.metadata.name.to_owned(),
+                uid: index.metadata().uid.to_owned(),
+            })
+            .collect()
+    }
+
+    pub fn version(&self) -> Version {
+        Version::V1
+    }
+
+    pub fn date(&self) -> Option<OffsetDateTime> {
+        None
+    }
+
+    pub fn indexes(&self) -> Result<impl Iterator<Item = Result<V1IndexReader>> + '_> {
+        Ok(self.indexes.iter().map(|index| index.open()))
+    }
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Index {
+    pub name: String,
+    pub uid: String,
+    #[serde(with = "time::serde::rfc3339")]
+    created_at: OffsetDateTime,
+    #[serde(with = "time::serde::rfc3339")]
+    updated_at: OffsetDateTime,
+    pub primary_key: Option<String>,
+}
+
+#[derive(Clone)]
+pub struct IndexMetadataV1 {
+    pub name: String,
+    pub metadata: crate::IndexMetadata,
+}
+
+impl From<Index> for IndexMetadataV1 {
+    fn from(index: Index) -> Self {
+        IndexMetadataV1 {
+            name: index.name,
+            metadata: crate::IndexMetadata {
+                uid: index.uid,
+                primary_key: index.primary_key,
+                created_at: index.created_at,
+                updated_at: index.updated_at,
+            },
+        }
+    }
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Metadata {
+    pub indexes: Vec<Index>,
+    pub db_version: String,
+    pub dump_version: crate::Version,
+}
+
+#[cfg(test)]
+pub(crate) mod test {
+    use std::fs::File;
+    use std::io::BufReader;
+
+    use flate2::bufread::GzDecoder;
+    use meili_snap::insta;
+    use tempfile::TempDir;
+
+    use super::*;
+
+    #[test]
+    fn read_dump_v1() {
+        let dump = File::open("tests/assets/v1.dump").unwrap();
+        let dir = TempDir::new().unwrap();
+        let mut dump = BufReader::new(dump);
+        let gz = GzDecoder::new(&mut dump);
+        let mut archive = tar::Archive::new(gz);
+        archive.unpack(dir.path()).unwrap();
+
+        let dump = V1Reader::open(dir).unwrap();
+
+        // top level infos
+        assert_eq!(dump.date(), None);
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut dnd_spells = indexes.pop().unwrap();
+
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "2022-10-02T13:23:39.976870431Z",
+          "updatedAt": "2022-10-02T13:27:54.353262482Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"b01c8371aea4c7171af0d4d846a2bdca");
+
+        // products tasks
+        let tasks = products.tasks().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"91de507f206ad21964584021932ba7a7");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "2022-10-02T13:15:29.477512777Z",
+          "updatedAt": "2022-10-02T13:21:12.671204856Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"b63dbed5bbc059f3e32bc471ae699bf5");
+
+        // movies tasks
+        let tasks = movies.tasks().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"55eef4de2bef7e84c5ce0bee47488f56");
+
+        // spells
+        insta::assert_json_snapshot!(dnd_spells.metadata(), @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "2022-10-02T13:38:26.358882984Z",
+          "updatedAt": "2022-10-02T13:38:26.385609433Z"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(dnd_spells.settings().unwrap());
+        let documents = dnd_spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"aa24c0cfc733d66c396237ad44263bed");
+
+        // spells tasks
+        let tasks = dnd_spells.tasks().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"836dd7d64d5ad20ad901c44b1b161a4c");
+    }
+}

dump/src/reader/v1/settings.rs

@@ -0,0 +1,94 @@
+use std::collections::{BTreeMap, BTreeSet};
+use std::result::Result as StdResult;
+use std::str::FromStr;
+
+use once_cell::sync::Lazy;
+use regex::Regex;
+use serde::{Deserialize, Deserializer, Serialize};
+
+#[derive(Default, Clone, Serialize, Deserialize, Debug)]
+#[serde(rename_all = "camelCase", deny_unknown_fields)]
+pub struct Settings {
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub ranking_rules: Option<Option<Vec<String>>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub distinct_attribute: Option<Option<String>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub searchable_attributes: Option<Option<Vec<String>>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub displayed_attributes: Option<Option<BTreeSet<String>>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub stop_words: Option<Option<BTreeSet<String>>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub synonyms: Option<Option<BTreeMap<String, Vec<String>>>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub attributes_for_faceting: Option<Option<Vec<String>>>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SettingsUpdate {
+    pub ranking_rules: UpdateState<Vec<RankingRule>>,
+    pub distinct_attribute: UpdateState<String>,
+    pub primary_key: UpdateState<String>,
+    pub searchable_attributes: UpdateState<Vec<String>>,
+    pub displayed_attributes: UpdateState<BTreeSet<String>>,
+    pub stop_words: UpdateState<BTreeSet<String>>,
+    pub synonyms: UpdateState<BTreeMap<String, Vec<String>>>,
+    pub attributes_for_faceting: UpdateState<Vec<String>>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum UpdateState<T> {
+    Update(T),
+    Clear,
+    Nothing,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum RankingRule {
+    Typo,
+    Words,
+    Proximity,
+    Attribute,
+    WordsPosition,
+    Exactness,
+    Asc(String),
+    Desc(String),
+}
+
+static ASC_DESC_REGEX: Lazy<Regex> =
+    Lazy::new(|| Regex::new(r#"(asc|desc)\(([\w_-]+)\)"#).unwrap());
+
+impl FromStr for RankingRule {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(match s {
+            "typo" => Self::Typo,
+            "words" => Self::Words,
+            "proximity" => Self::Proximity,
+            "attribute" => Self::Attribute,
+            "wordsPosition" => Self::WordsPosition,
+            "exactness" => Self::Exactness,
+            text => {
+                let caps = ASC_DESC_REGEX.captures(text).ok_or(())?;
+                let order = caps.get(1).unwrap().as_str();
+                let field_name = caps.get(2).unwrap().as_str();
+                match order {
+                    "asc" => Self::Asc(field_name.to_string()),
+                    "desc" => Self::Desc(field_name.to_string()),
+                    _ => return Err(()),
+                }
+            }
+        })
+    }
+}
+
+// Any value that is present is considered Some value, including null.
+fn deserialize_some<'de, T, D>(deserializer: D) -> StdResult<Option<T>, D::Error>
+where
+    T: Deserialize<'de>,
+    D: Deserializer<'de>,
+{
+    Deserialize::deserialize(deserializer).map(Some)
+}

dump/src/reader/v1/snapshots/dump__reader__v1__test__read_dump_v1-10.snap

@@ -0,0 +1,24 @@
+---
+source: dump/src/reader/v1/mod.rs
+expression: dnd_spells.settings().unwrap()
+---
+{
+  "rankingRules": [
+    "typo",
+    "words",
+    "proximity",
+    "attribute",
+    "wordsPosition",
+    "exactness"
+  ],
+  "distinctAttribute": null,
+  "searchableAttributes": [
+    "*"
+  ],
+  "displayedAttributes": [
+    "*"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "attributesForFaceting": []
+}

dump/src/reader/v1/snapshots/dump__reader__v1__test__read_dump_v1-2.snap

@@ -0,0 +1,38 @@
+---
+source: dump/src/reader/v1/mod.rs
+expression: products.settings().unwrap()
+---
+{
+  "rankingRules": [
+    "typo",
+    "words",
+    "proximity",
+    "attribute",
+    "wordsPosition",
+    "exactness"
+  ],
+  "distinctAttribute": null,
+  "searchableAttributes": [
+    "*"
+  ],
+  "displayedAttributes": [
+    "*"
+  ],
+  "stopWords": [],
+  "synonyms": {
+    "android": [
+      "phone",
+      "smartphone"
+    ],
+    "iphone": [
+      "phone",
+      "smartphone"
+    ],
+    "phone": [
+      "android",
+      "iphone",
+      "smartphone"
+    ]
+  },
+  "attributesForFaceting": []
+}

dump/src/reader/v1/snapshots/dump__reader__v1__test__read_dump_v1-6.snap

@@ -0,0 +1,28 @@
+---
+source: dump/src/reader/v1/mod.rs
+expression: movies.settings().unwrap()
+---
+{
+  "rankingRules": [
+    "typo",
+    "words",
+    "proximity",
+    "attribute",
+    "wordsPosition",
+    "exactness",
+    "asc(release_date)"
+  ],
+  "distinctAttribute": null,
+  "searchableAttributes": [
+    "*"
+  ],
+  "displayedAttributes": [
+    "*"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "attributesForFaceting": [
+    "id",
+    "genres"
+  ]
+}

dump/src/reader/v1/update.rs

@@ -0,0 +1,74 @@
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+
+use super::settings::SettingsUpdate;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(tag = "name")]
+pub enum UpdateType {
+    ClearAll,
+    Customs,
+    DocumentsAddition { number: usize },
+    DocumentsPartial { number: usize },
+    DocumentsDeletion { number: usize },
+    Settings { settings: Box<SettingsUpdate> },
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ProcessedUpdateResult {
+    pub update_id: u64,
+    #[serde(rename = "type")]
+    pub update_type: UpdateType,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub error: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub error_type: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub error_code: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub error_link: Option<String>,
+    pub duration: f64, // in seconds
+    #[serde(with = "time::serde::rfc3339")]
+    pub enqueued_at: OffsetDateTime,
+    #[serde(with = "time::serde::rfc3339")]
+    pub processed_at: OffsetDateTime,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct EnqueuedUpdateResult {
+    pub update_id: u64,
+    #[serde(rename = "type")]
+    pub update_type: UpdateType,
+    #[serde(with = "time::serde::rfc3339")]
+    pub enqueued_at: OffsetDateTime,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase", tag = "status")]
+pub enum UpdateStatus {
+    Enqueued {
+        #[serde(flatten)]
+        content: EnqueuedUpdateResult,
+    },
+    Failed {
+        #[serde(flatten)]
+        content: ProcessedUpdateResult,
+    },
+    Processed {
+        #[serde(flatten)]
+        content: ProcessedUpdateResult,
+    },
+}
+
+impl UpdateStatus {
+    pub fn enqueued_at(&self) -> &OffsetDateTime {
+        match self {
+            UpdateStatus::Enqueued { content } => &content.enqueued_at,
+            UpdateStatus::Failed { content } | UpdateStatus::Processed { content } => {
+                &content.enqueued_at
+            }
+        }
+    }
+}

dump/src/reader/v2/errors.rs

@@ -0,0 +1,14 @@
+use http::StatusCode;
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize, Clone)]
+#[cfg_attr(test, derive(serde::Serialize))]
+#[serde(rename_all = "camelCase")]
+pub struct ResponseError {
+    #[serde(skip)]
+    pub code: StatusCode,
+    pub message: String,
+    pub error_code: String,
+    pub error_type: String,
+    pub error_link: String,
+}

dump/src/reader/v2/meta.rs

@@ -0,0 +1,18 @@
+use serde::Deserialize;
+use uuid::Uuid;
+
+use super::Settings;
+
+#[derive(Deserialize, Debug, Clone)]
+#[cfg_attr(test, derive(serde::Serialize))]
+pub struct IndexUuid {
+    pub uid: String,
+    pub uuid: Uuid,
+}
+
+#[derive(Deserialize)]
+#[cfg_attr(test, derive(serde::Serialize))]
+pub struct DumpMeta {
+    pub settings: Settings<super::Unchecked>,
+    pub primary_key: Option<String>,
+}

dump/src/reader/v2/mod.rs

@@ -0,0 +1,387 @@
+//! ```text
+//! .
+//! ├── indexes
+//! │   ├── index-40d14c5f-37ae-4873-9d51-b69e014a0d30
+//! │   │   ├── documents.jsonl
+//! │   │   └── meta.json
+//! │   ├── index-88202369-4524-4410-9b3d-3e924c867fec
+//! │   │   ├── documents.jsonl
+//! │   │   └── meta.json
+//! │   ├── index-b7f2d03b-bf9b-40d9-a25b-94dc5ec60c32
+//! │   │   ├── documents.jsonl
+//! │   │   └── meta.json
+//! │   └── index-dc9070b3-572d-4f30-ab45-d4903ab71708
+//! │       ├── documents.jsonl
+//! │       └── meta.json
+//! ├── index_uuids
+//! │   └── data.jsonl
+//! ├── metadata.json
+//! └── updates
+//!     ├── data.jsonl
+//!     └── update_files
+//!         └── update_202573df-718b-4d80-9a65-2ee397c23dc3
+//! ```
+
+use std::fs::{self, File};
+use std::io::{BufRead, BufReader};
+use std::path::Path;
+
+use serde::{Deserialize, Serialize};
+use tempfile::TempDir;
+use time::OffsetDateTime;
+
+pub mod errors;
+pub mod meta;
+pub mod settings;
+pub mod updates;
+
+use self::meta::{DumpMeta, IndexUuid};
+use super::compat::v2_to_v3::CompatV2ToV3;
+use super::Document;
+use crate::{IndexMetadata, Result, Version};
+
+pub type Settings<T> = settings::Settings<T>;
+pub type Setting<T> = settings::Setting<T>;
+pub type Checked = settings::Checked;
+pub type Unchecked = settings::Unchecked;
+
+pub type Task = updates::UpdateEntry;
+
+// everything related to the errors
+pub type ResponseError = errors::ResponseError;
+
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct Metadata {
+    db_version: String,
+    index_db_size: usize,
+    update_db_size: usize,
+    #[serde(with = "time::serde::rfc3339")]
+    dump_date: OffsetDateTime,
+}
+
+pub struct V2Reader {
+    dump: TempDir,
+    metadata: Metadata,
+    tasks: BufReader<File>,
+    pub index_uuid: Vec<IndexUuid>,
+}
+
+impl V2Reader {
+    pub fn open(dump: TempDir) -> Result<Self> {
+        let meta_file = fs::read(dump.path().join("metadata.json"))?;
+        let metadata = serde_json::from_reader(&*meta_file)?;
+        let index_uuid = File::open(dump.path().join("index_uuids/data.jsonl"))?;
+        let index_uuid = BufReader::new(index_uuid);
+        let index_uuid = index_uuid
+            .lines()
+            .map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) })
+            .collect::<Result<Vec<_>>>()?;
+
+        Ok(V2Reader {
+            metadata,
+            tasks: BufReader::new(
+                File::open(dump.path().join("updates").join("data.jsonl")).unwrap(),
+            ),
+            index_uuid,
+            dump,
+        })
+    }
+
+    pub fn to_v3(self) -> CompatV2ToV3 {
+        CompatV2ToV3::new(self)
+    }
+
+    pub fn index_uuid(&self) -> Vec<IndexUuid> {
+        self.index_uuid.clone()
+    }
+
+    pub fn version(&self) -> Version {
+        Version::V2
+    }
+
+    pub fn date(&self) -> Option<OffsetDateTime> {
+        Some(self.metadata.dump_date)
+    }
+
+    pub fn indexes(&self) -> Result<impl Iterator<Item = Result<V2IndexReader>> + '_> {
+        Ok(self.index_uuid.iter().map(|index| -> Result<_> {
+            V2IndexReader::new(
+                index.uid.clone(),
+                &self.dump.path().join("indexes").join(format!("index-{}", index.uuid)),
+            )
+        }))
+    }
+
+    pub fn tasks(&mut self) -> Box<dyn Iterator<Item = Result<(Task, Option<UpdateFile>)>> + '_> {
+        Box::new((&mut self.tasks).lines().map(|line| -> Result<_> {
+            let task: Task = serde_json::from_str(&line?)?;
+            if !task.is_finished() {
+                if let Some(uuid) = task.get_content_uuid() {
+                    let update_file_path = self
+                        .dump
+                        .path()
+                        .join("updates")
+                        .join("update_files")
+                        .join(format!("update_{}", uuid));
+                    Ok((task, Some(UpdateFile::new(&update_file_path)?)))
+                } else {
+                    Ok((task, None))
+                }
+            } else {
+                Ok((task, None))
+            }
+        }))
+    }
+}
+
+pub struct V2IndexReader {
+    metadata: IndexMetadata,
+    settings: Settings<Checked>,
+
+    documents: BufReader<File>,
+}
+
+impl V2IndexReader {
+    pub fn new(name: String, path: &Path) -> Result<Self> {
+        let meta = File::open(path.join("meta.json"))?;
+        let meta: DumpMeta = serde_json::from_reader(meta)?;
+
+        let metadata = IndexMetadata {
+            uid: name,
+            primary_key: meta.primary_key,
+            // FIXME: Iterate over the whole task queue to find the creation and last update date.
+            created_at: OffsetDateTime::now_utc(),
+            updated_at: OffsetDateTime::now_utc(),
+        };
+
+        let ret = V2IndexReader {
+            metadata,
+            settings: meta.settings.check(),
+            documents: BufReader::new(File::open(path.join("documents.jsonl"))?),
+        };
+
+        Ok(ret)
+    }
+
+    pub fn metadata(&self) -> &IndexMetadata {
+        &self.metadata
+    }
+
+    pub fn documents(&mut self) -> Result<impl Iterator<Item = Result<Document>> + '_> {
+        Ok((&mut self.documents)
+            .lines()
+            .map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) }))
+    }
+
+    pub fn settings(&mut self) -> Result<Settings<Checked>> {
+        Ok(self.settings.clone())
+    }
+}
+
+pub struct UpdateFile {
+    documents: Vec<Document>,
+    index: usize,
+}
+
+impl UpdateFile {
+    fn new(path: &Path) -> Result<Self> {
+        let reader = BufReader::new(File::open(path)?);
+        Ok(UpdateFile { documents: serde_json::from_reader(reader)?, index: 0 })
+    }
+}
+
+impl Iterator for UpdateFile {
+    type Item = Result<Document>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.index += 1;
+        self.documents.get(self.index - 1).cloned().map(Ok)
+    }
+}
+
+#[cfg(test)]
+pub(crate) mod test {
+    use std::fs::File;
+    use std::io::BufReader;
+
+    use flate2::bufread::GzDecoder;
+    use meili_snap::insta;
+    use tempfile::TempDir;
+
+    use super::*;
+
+    #[test]
+    fn read_dump_v2() {
+        let dump = File::open("tests/assets/v2.dump").unwrap();
+        let dir = TempDir::new().unwrap();
+        let mut dump = BufReader::new(dump);
+        let gz = GzDecoder::new(&mut dump);
+        let mut archive = tar::Archive::new(gz);
+        archive.unpack(dir.path()).unwrap();
+
+        let mut dump = V2Reader::open(dir).unwrap();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2022-10-09 20:27:59.904096267 +00:00:00");
+
+        // tasks
+        let tasks = dump.tasks().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, mut update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"ec5fc0a14bf735ad4e361d5aa8a89ac6");
+        assert_eq!(update_files.len(), 9);
+        assert!(update_files[0].is_some()); // the enqueued document addition
+        assert!(update_files[1..].iter().all(|u| u.is_none())); // everything already processed
+
+        let update_file = update_files.remove(0).unwrap().collect::<Result<Vec<_>>>().unwrap();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(update_file), @"7b8889539b669c7b9ddba448bafa385d");
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies2 = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"548284a84de510f71e88e6cdea495cf5");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 110);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"d153b5a81d8b3cdcbe1dec270b574022");
+
+        // movies2
+        insta::assert_json_snapshot!(movies2.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies_2",
+          "primaryKey": null,
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies2.settings().unwrap());
+        let documents = movies2.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 0);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"d751713988987e9331980363e24189ce");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+
+    #[test]
+    fn read_dump_v2_from_meilisearch_v0_22_0_issue_3435() {
+        let dump = File::open("tests/assets/v2-v0.22.0.dump").unwrap();
+        let dir = TempDir::new().unwrap();
+        let mut dump = BufReader::new(dump);
+        let gz = GzDecoder::new(&mut dump);
+        let mut archive = tar::Archive::new(gz);
+        archive.unpack(dir.path()).unwrap();
+
+        let mut dump = V2Reader::open(dir).unwrap();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2023-01-30 16:26:09.247261 +00:00:00");
+
+        // tasks
+        let tasks = dump.tasks().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        meili_snap::snapshot_hash!(meili_snap::json_string!(tasks), @"aca8ba13046272664eb3ea2da3031633");
+        assert_eq!(update_files.len(), 8);
+        assert!(update_files[0..].iter().all(|u| u.is_none())); // everything has already been processed
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(products.settings().unwrap());
+        let documents = products.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"548284a84de510f71e88e6cdea495cf5");
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(movies.settings().unwrap());
+        let documents = movies.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"0227598af846e574139ee0b80e03a720");
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_json_snapshot!(spells.settings().unwrap());
+        let documents = spells.documents().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        assert_eq!(documents.len(), 10);
+        meili_snap::snapshot_hash!(format!("{:#?}", documents), @"235016433dd04262c7f2da01d1e808ce");
+    }
+}

dump/src/reader/v2/settings.rs

@@ -0,0 +1,269 @@
+use std::collections::{BTreeMap, BTreeSet};
+use std::fmt;
+use std::marker::PhantomData;
+use std::str::FromStr;
+
+use serde::{Deserialize, Deserializer};
+
+#[cfg(test)]
+fn serialize_with_wildcard<S>(
+    field: &Setting<Vec<String>>,
+    s: S,
+) -> std::result::Result<S::Ok, S::Error>
+where
+    S: serde::Serializer,
+{
+    use serde::Serialize;
+
+    let wildcard = vec!["*".to_string()];
+    match field {
+        Setting::Set(value) => Some(value),
+        Setting::Reset => Some(&wildcard),
+        Setting::NotSet => None,
+    }
+    .serialize(s)
+}
+
+#[derive(Clone, Default, Debug)]
+#[cfg_attr(test, derive(serde::Serialize))]
+pub struct Checked;
+
+#[derive(Clone, Default, Debug, Deserialize)]
+#[cfg_attr(test, derive(serde::Serialize))]
+pub struct Unchecked;
+
+#[derive(Debug, Clone, Default, Deserialize)]
+#[cfg_attr(test, derive(serde::Serialize))]
+#[serde(deny_unknown_fields)]
+#[serde(rename_all = "camelCase")]
+#[serde(bound(serialize = "T: serde::Serialize", deserialize = "T: Deserialize<'static>"))]
+pub struct Settings<T> {
+    #[serde(
+        default,
+        serialize_with = "serialize_with_wildcard",
+        skip_serializing_if = "Setting::is_not_set"
+    )]
+    pub displayed_attributes: Setting<Vec<String>>,
+
+    #[serde(
+        default,
+        serialize_with = "serialize_with_wildcard",
+        skip_serializing_if = "Setting::is_not_set"
+    )]
+    pub searchable_attributes: Setting<Vec<String>>,
+
+    #[serde(default, skip_serializing_if = "Setting::is_not_set")]
+    pub filterable_attributes: Setting<BTreeSet<String>>,
+    #[serde(default, skip_serializing_if = "Setting::is_not_set")]
+    pub sortable_attributes: Setting<BTreeSet<String>>,
+    #[serde(default, skip_serializing_if = "Setting::is_not_set")]
+    pub ranking_rules: Setting<Vec<String>>,
+    #[serde(default, skip_serializing_if = "Setting::is_not_set")]
+    pub stop_words: Setting<BTreeSet<String>>,
+    #[serde(default, skip_serializing_if = "Setting::is_not_set")]
+    pub synonyms: Setting<BTreeMap<String, Vec<String>>>,
+    #[serde(default, skip_serializing_if = "Setting::is_not_set")]
+    pub distinct_attribute: Setting<String>,
+
+    #[serde(skip)]
+    pub _kind: PhantomData<T>,
+}
+
+impl Settings<Unchecked> {
+    pub fn check(self) -> Settings<Checked> {
+        let displayed_attributes = match self.displayed_attributes {
+            Setting::Set(fields) => {
+                if fields.iter().any(|f| f == "*") {
+                    Setting::Reset
+                } else {
+                    Setting::Set(fields)
+                }
+            }
+            otherwise => otherwise,
+        };
+
+        let searchable_attributes = match self.searchable_attributes {
+            Setting::Set(fields) => {
+                if fields.iter().any(|f| f == "*") {
+                    Setting::Reset
+                } else {
+                    Setting::Set(fields)
+                }
+            }
+            otherwise => otherwise,
+        };
+
+        Settings {
+            displayed_attributes,
+            searchable_attributes,
+            filterable_attributes: self.filterable_attributes,
+            sortable_attributes: self.sortable_attributes,
+            ranking_rules: self.ranking_rules,
+            stop_words: self.stop_words,
+            synonyms: self.synonyms,
+            distinct_attribute: self.distinct_attribute,
+            _kind: PhantomData,
+        }
+    }
+}
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum Setting<T> {
+    Set(T),
+    Reset,
+    NotSet,
+}
+
+impl<T> Default for Setting<T> {
+    fn default() -> Self {
+        Self::NotSet
+    }
+}
+
+impl<T> Setting<T> {
+    pub const fn is_not_set(&self) -> bool {
+        matches!(self, Self::NotSet)
+    }
+
+    pub fn map<A>(self, f: fn(T) -> A) -> Setting<A> {
+        match self {
+            Setting::Set(a) => Setting::Set(f(a)),
+            Setting::Reset => Setting::Reset,
+            Setting::NotSet => Setting::NotSet,
+        }
+    }
+}
+
+#[cfg(test)]
+impl<T: serde::Serialize> serde::Serialize for Setting<T> {
+    fn serialize<S>(&self, serializer: S) -> std::result::Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        match self {
+            Self::Set(value) => Some(value),
+            // Usually not_set isn't serialized by setting skip_serializing_if field attribute
+            Self::NotSet | Self::Reset => None,
+        }
+        .serialize(serializer)
+    }
+}
+
+impl<'de, T: Deserialize<'de>> Deserialize<'de> for Setting<T> {
+    fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Deserialize::deserialize(deserializer).map(|x| match x {
+            Some(x) => Self::Set(x),
+            None => Self::Reset, // Reset is forced by sending null value
+        })
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Criterion {
+    /// Sorted by decreasing number of matched query terms.
+    /// Query words at the front of an attribute is considered better than if it was at the back.
+    Words,
+    /// Sorted by increasing number of typos.
+    Typo,
+    /// Sorted by increasing distance between matched query terms.
+    Proximity,
+    /// Documents with quey words contained in more important
+    /// attributes are considered better.
+    Attribute,
+    /// Dynamically sort at query time the documents. None, one or multiple Asc/Desc sortable
+    /// attributes can be used in place of this criterion at query time.
+    Sort,
+    /// Sorted by the similarity of the matched words with the query words.
+    Exactness,
+    /// Sorted by the increasing value of the field specified.
+    Asc(String),
+    /// Sorted by the decreasing value of the field specified.
+    Desc(String),
+}
+
+impl Criterion {
+    /// Returns the field name parameter of this criterion.
+    pub fn field_name(&self) -> Option<&str> {
+        match self {
+            Criterion::Asc(name) | Criterion::Desc(name) => Some(name),
+            _otherwise => None,
+        }
+    }
+}
+
+impl FromStr for Criterion {
+    // since we're not going to show the custom error message we can override the
+    // error type.
+    type Err = ();
+
+    fn from_str(text: &str) -> Result<Criterion, Self::Err> {
+        match text {
+            "words" => Ok(Criterion::Words),
+            "typo" => Ok(Criterion::Typo),
+            "proximity" => Ok(Criterion::Proximity),
+            "attribute" => Ok(Criterion::Attribute),
+            "sort" => Ok(Criterion::Sort),
+            "exactness" => Ok(Criterion::Exactness),
+            text => match AscDesc::from_str(text) {
+                Ok(AscDesc::Asc(field)) => Ok(Criterion::Asc(field)),
+                Ok(AscDesc::Desc(field)) => Ok(Criterion::Desc(field)),
+                Err(_) => Err(()),
+            },
+        }
+    }
+}
+
+#[derive(Debug, Deserialize, Clone, PartialEq, Eq)]
+pub enum AscDesc {
+    Asc(String),
+    Desc(String),
+}
+
+impl FromStr for AscDesc {
+    type Err = ();
+
+    // since we don't know if this comes from the old or new syntax we need to check
+    // for both syntax.
+    // WARN: this code doesn't come from the original meilisearch v0.22.0 but was
+    // written specifically to be able to import the dump of meilisearch v0.21.0 AND
+    // meilisearch v0.22.0.
+    fn from_str(text: &str) -> Result<AscDesc, Self::Err> {
+        if let Some((field_name, asc_desc)) = text.rsplit_once(':') {
+            match asc_desc {
+                "asc" => Ok(AscDesc::Asc(field_name.to_string())),
+                "desc" => Ok(AscDesc::Desc(field_name.to_string())),
+                _ => Err(()),
+            }
+        } else if text.starts_with("asc(") && text.ends_with(')') {
+            Ok(AscDesc::Asc(
+                text.strip_prefix("asc(").unwrap().strip_suffix(')').unwrap().to_string(),
+            ))
+        } else if text.starts_with("desc(") && text.ends_with(')') {
+            Ok(AscDesc::Desc(
+                text.strip_prefix("desc(").unwrap().strip_suffix(')').unwrap().to_string(),
+            ))
+        } else {
+            Err(())
+        }
+    }
+}
+
+impl fmt::Display for Criterion {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        use Criterion::*;
+
+        match self {
+            Words => f.write_str("words"),
+            Typo => f.write_str("typo"),
+            Proximity => f.write_str("proximity"),
+            Attribute => f.write_str("attribute"),
+            Sort => f.write_str("sort"),
+            Exactness => f.write_str("exactness"),
+            Asc(attr) => write!(f, "{}:asc", attr),
+            Desc(attr) => write!(f, "{}:desc", attr),
+        }
+    }
+}

dump/src/reader/v2/snapshots/dump__reader__v2__test__read_dump_v2-11.snap

@@ -0,0 +1,23 @@
+---
+source: dump/src/reader/v2/mod.rs
+expression: movies2.settings().unwrap()
+---
+{
+  "displayedAttributes": [
+    "*"
+  ],
+  "searchableAttributes": [
+    "*"
+  ],
+  "filterableAttributes": [],
+  "rankingRules": [
+    "words",
+    "typo",
+    "proximity",
+    "attribute",
+    "exactness"
+  ],
+  "stopWords": [],
+  "synonyms": {},
+  "distinctAttribute": null
+}