Only spawn request threads if necessary

4617: Destructure `EmbedderOptions` so we don't miss some options r=dureuill a=dureuill

# Pull Request

## Related issue
#4595 was caused by the code not destructuring the embedder options.


## What does this PR do?
This PR adds the missing `url` parameter for ollama, and makes sure similar issue cannot happen in the future



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

Cargo.lock

@@ -889,9 +889,9 @@ dependencies = [
 
 [[package]]
 name = "charabia"
-version = "0.8.9"
+version = "0.8.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6a65052f308636e5d5e1777f0dbc07919f5fbac24b6c8ad3e140472e5520de9"
+checksum = "933f20f2269b24d32fd5503e7b3c268af902190daf8d9d2b73ed2e75d77c00b4"
 dependencies = [
  "aho-corasick",
  "cow-utils",

meilisearch-types/Cargo.toml

@@ -57,3 +57,5 @@ greek = ["milli/greek"]
 khmer = ["milli/khmer"]
 # allow vietnamese specialized tokenization
 vietnamese = ["milli/vietnamese"]
+# force swedish character recomposition
+swedish-recomposition = ["milli/swedish-recomposition"]

meilisearch/Cargo.toml

@@ -156,6 +156,7 @@ thai = ["meilisearch-types/thai"]
 greek = ["meilisearch-types/greek"]
 khmer = ["meilisearch-types/khmer"]
 vietnamese = ["meilisearch-types/vietnamese"]
+swedish-recomposition = ["meilisearch-types/swedish-recomposition"]
 
 [package.metadata.mini-dashboard]
 assets-url = "https://github.com/meilisearch/mini-dashboard/releases/download/v0.2.13/build.zip"

meilisearch/src/routes/mod.rs

@@ -367,12 +367,6 @@ async fn get_version(
     })
 }
 
-#[derive(Serialize)]
-struct KeysResponse {
-    private: Option<String>,
-    public: Option<String>,
-}
-
 pub async fn get_health(
     index_scheduler: Data<IndexScheduler>,
     auth_controller: Data<AuthController>,

milli/Cargo.toml

@@ -17,7 +17,7 @@ bincode = "1.3.3"
 bstr = "1.9.0"
 bytemuck = { version = "1.14.0", features = ["extern_crate_alloc"] }
 byteorder = "1.5.0"
-charabia = { version = "0.8.9", default-features = false }
+charabia = { version = "0.8.10", default-features = false }
 concat-arrays = "0.1.2"
 crossbeam-channel = "0.5.11"
 deserr = "0.6.1"
@@ -136,7 +136,11 @@ greek = ["charabia/greek"]
 # allow khmer specialized tokenization
 khmer = ["charabia/khmer"]
 
+# allow vietnamese specialized tokenization
 vietnamese = ["charabia/vietnamese"]
 
+# force swedish character recomposition
+swedish-recomposition = ["charabia/swedish-recomposition"]
+
 # allow CUDA support, see <https://github.com/meilisearch/meilisearch/issues/4306>
 cuda = ["candle-core/cuda"]

milli/src/update/index_documents/extract/mod.rs

@@ -229,12 +229,15 @@ fn send_original_documents_data(
     let documents_chunk_cloned = original_documents_chunk.clone();
     let lmdb_writer_sx_cloned = lmdb_writer_sx.clone();
 
-    let request_threads = ThreadPoolNoAbortBuilder::new()
-        .num_threads(crate::vector::REQUEST_PARALLELISM)
-        .thread_name(|index| format!("embedding-request-{index}"))
-        .build()?;
+    let new_embedding_configs = settings_diff.new.embedding_configs.clone();
 
-    if settings_diff.reindex_vectors() || !settings_diff.settings_update_only() {
+    if (settings_diff.reindex_vectors() || !settings_diff.settings_update_only())
+        && new_embedding_configs.get_default().is_some()
+    {
+        let request_threads = ThreadPoolNoAbortBuilder::new()
+            .num_threads(crate::vector::REQUEST_PARALLELISM)
+            .thread_name(|index| format!("embedding-request-{index}"))
+            .build()?;
         let settings_diff = settings_diff.clone();
         rayon::spawn(move || {
             for (name, (embedder, prompt)) in settings_diff.new.embedding_configs.clone() {

milli/src/vector/settings.rs

@@ -301,10 +301,14 @@ impl From<EmbeddingConfig> for EmbeddingSettings {
     fn from(value: EmbeddingConfig) -> Self {
         let EmbeddingConfig { embedder_options, prompt } = value;
         match embedder_options {
-            super::EmbedderOptions::HuggingFace(options) => Self {
+            super::EmbedderOptions::HuggingFace(super::hf::EmbedderOptions {
+                model,
+                revision,
+                distribution,
+            }) => Self {
                 source: Setting::Set(EmbedderSource::HuggingFace),
-                model: Setting::Set(options.model),
-                revision: options.revision.map(Setting::Set).unwrap_or_default(),
+                model: Setting::Set(model),
+                revision: revision.map(Setting::Set).unwrap_or_default(),
                 api_key: Setting::NotSet,
                 dimensions: Setting::NotSet,
                 document_template: Setting::Set(prompt.template),
@@ -314,14 +318,19 @@ impl From<EmbeddingConfig> for EmbeddingSettings {
                 path_to_embeddings: Setting::NotSet,
                 embedding_object: Setting::NotSet,
                 input_type: Setting::NotSet,
-                distribution: options.distribution.map(Setting::Set).unwrap_or_default(),
+                distribution: distribution.map(Setting::Set).unwrap_or_default(),
             },
-            super::EmbedderOptions::OpenAi(options) => Self {
+            super::EmbedderOptions::OpenAi(super::openai::EmbedderOptions {
+                api_key,
+                embedding_model,
+                dimensions,
+                distribution,
+            }) => Self {
                 source: Setting::Set(EmbedderSource::OpenAi),
-                model: Setting::Set(options.embedding_model.name().to_owned()),
+                model: Setting::Set(embedding_model.name().to_owned()),
                 revision: Setting::NotSet,
-                api_key: options.api_key.map(Setting::Set).unwrap_or_default(),
-                dimensions: options.dimensions.map(Setting::Set).unwrap_or_default(),
+                api_key: api_key.map(Setting::Set).unwrap_or_default(),
+                dimensions: dimensions.map(Setting::Set).unwrap_or_default(),
                 document_template: Setting::Set(prompt.template),
                 url: Setting::NotSet,
                 query: Setting::NotSet,
@@ -329,29 +338,37 @@ impl From<EmbeddingConfig> for EmbeddingSettings {
                 path_to_embeddings: Setting::NotSet,
                 embedding_object: Setting::NotSet,
                 input_type: Setting::NotSet,
-                distribution: options.distribution.map(Setting::Set).unwrap_or_default(),
+                distribution: distribution.map(Setting::Set).unwrap_or_default(),
             },
-            super::EmbedderOptions::Ollama(options) => Self {
+            super::EmbedderOptions::Ollama(super::ollama::EmbedderOptions {
+                embedding_model,
+                url,
+                api_key,
+                distribution,
+            }) => Self {
                 source: Setting::Set(EmbedderSource::Ollama),
-                model: Setting::Set(options.embedding_model.to_owned()),
+                model: Setting::Set(embedding_model),
                 revision: Setting::NotSet,
-                api_key: options.api_key.map(Setting::Set).unwrap_or_default(),
+                api_key: api_key.map(Setting::Set).unwrap_or_default(),
                 dimensions: Setting::NotSet,
                 document_template: Setting::Set(prompt.template),
-                url: Setting::NotSet,
+                url: url.map(Setting::Set).unwrap_or_default(),
                 query: Setting::NotSet,
                 input_field: Setting::NotSet,
                 path_to_embeddings: Setting::NotSet,
                 embedding_object: Setting::NotSet,
                 input_type: Setting::NotSet,
-                distribution: options.distribution.map(Setting::Set).unwrap_or_default(),
+                distribution: distribution.map(Setting::Set).unwrap_or_default(),
             },
-            super::EmbedderOptions::UserProvided(options) => Self {
+            super::EmbedderOptions::UserProvided(super::manual::EmbedderOptions {
+                dimensions,
+                distribution,
+            }) => Self {
                 source: Setting::Set(EmbedderSource::UserProvided),
                 model: Setting::NotSet,
                 revision: Setting::NotSet,
                 api_key: Setting::NotSet,
-                dimensions: Setting::Set(options.dimensions),
+                dimensions: Setting::Set(dimensions),
                 document_template: Setting::NotSet,
                 url: Setting::NotSet,
                 query: Setting::NotSet,
@@ -359,7 +376,7 @@ impl From<EmbeddingConfig> for EmbeddingSettings {
                 path_to_embeddings: Setting::NotSet,
                 embedding_object: Setting::NotSet,
                 input_type: Setting::NotSet,
-                distribution: options.distribution.map(Setting::Set).unwrap_or_default(),
+                distribution: distribution.map(Setting::Set).unwrap_or_default(),
             },
             super::EmbedderOptions::Rest(super::rest::EmbedderOptions {
                 api_key,