Use unstable arroy version containing incremental indexing

Cargo.lock

@@ -394,8 +394,7 @@ checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
 [[package]]
 name = "arroy"
 version = "0.6.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08e6111f351d004bd13e95ab540721272136fd3218b39d3ec95a2ea1c4e6a0a6"
+source = "git+https://github.com/meilisearch/arroy.git?rev=5b748bac2c69c65a97980901b02067a3a545e357#5b748bac2c69c65a97980901b02067a3a545e357"
 dependencies = [
  "bytemuck",
  "byteorder",

crates/milli/Cargo.toml

@@ -87,7 +87,8 @@ rhai = { git = "https://github.com/rhaiscript/rhai", rev = "ef3df63121d27aacd838
     "no_time",
     "sync",
 ] }
-arroy = "0.6.1"
+# arroy = "0.6.1"
+arroy = { git = "https://github.com/meilisearch/arroy.git", rev = "5b748bac2c69c65a97980901b02067a3a545e357" } # incremental update
 rand = "0.8.5"
 tracing = "0.1.41"
 ureq = { version = "2.12.1", features = ["json"] }

crates/milli/src/progress.rs

@@ -266,12 +266,15 @@ impl Step for arroy::MainStep {
                 "writing the descendants and metadata"
             }
             arroy::MainStep::RetrieveTheUpdatedItems => "retrieve the updated items",
-            arroy::MainStep::RetrievingTheTreeAndItemNodes => "retrieving the tree and item nodes",
-            arroy::MainStep::UpdatingTheTrees => "updating the trees",
-            arroy::MainStep::CreateNewTrees => "create new trees",
-            arroy::MainStep::WritingNodesToDatabase => "writing nodes to database",
-            arroy::MainStep::DeleteExtraneousTrees => "delete extraneous trees",
             arroy::MainStep::WriteTheMetadata => "write the metadata",
+            arroy::MainStep::RetrievingTheItemsIds => "retrieving the items ids",
+            arroy::MainStep::RetrievingTheUsedTreeNodes => "retrieving the used tree nodes",
+            arroy::MainStep::DeletingExtraTrees => "deleting extra trees",
+            arroy::MainStep::RemoveItemsFromExistingTrees => "remove items from existing trees",
+            arroy::MainStep::InsertItemsInCurrentTrees => "insert items in current trees",
+            arroy::MainStep::IncrementalIndexLargeDescendants => {
+                "incremental index large descendants"
+            }
         }
         .into()
     }