Support ignore_unavailable query param

quickwit/quickwit-metastore/src/tests/index.rs

@@ -677,9 +677,14 @@ pub async fn test_metastore_list_indexes<MetastoreToTest: MetastoreServiceExt +
     let index_uri_4 = format!("ram:///indexes/{index_id_4}");
     let index_config_4 = IndexConfig::for_test(&index_id_4, &index_uri_4);
 
+    let index_id_5 = format!("my-exact-index-{index_id_fragment}-5");
+    let index_uri_5 = format!("ram:///indexes/{index_id_5}");
+    let index_config_5 = IndexConfig::for_test(&index_id_5, &index_uri_5);
+
     let index_id_patterns = vec![
         format!("prefix-*-{index_id_fragment}-suffix-*"),
         format!("prefix*{index_id_fragment}*suffix-*"),
+        format!("my-exact-index-{index_id_fragment}-5"),
     ];
     let indexes_count = metastore
         .list_indexes_metadata(ListIndexesMetadataRequest { index_id_patterns })
@@ -715,8 +720,17 @@ pub async fn test_metastore_list_indexes<MetastoreToTest: MetastoreServiceExt +
         .unwrap()
         .index_uid()
         .clone();
+    let index_uid_5 = metastore
+        .create_index(CreateIndexRequest::try_from_index_config(&index_config_5).unwrap())
+        .await
+        .unwrap()
+        .index_uid()
+        .clone();
 
-    let index_id_patterns = vec![format!("prefix-*-{index_id_fragment}-suffix-*")];
+    let index_id_patterns = vec![
+        format!("prefix-*-{index_id_fragment}-suffix-*"),
+        format!("my-exact-index-{index_id_fragment}-5"),
+    ];
     let indexes_count = metastore
         .list_indexes_metadata(ListIndexesMetadataRequest { index_id_patterns })
         .await
@@ -725,12 +739,13 @@ pub async fn test_metastore_list_indexes<MetastoreToTest: MetastoreServiceExt +
         .await
         .unwrap()
         .len();
-    assert_eq!(indexes_count, 2);
+    assert_eq!(indexes_count, 3);
 
     cleanup_index(&mut metastore, index_uid_1).await;
     cleanup_index(&mut metastore, index_uid_2).await;
     cleanup_index(&mut metastore, index_uid_3).await;
     cleanup_index(&mut metastore, index_uid_4).await;
+    cleanup_index(&mut metastore, index_uid_5).await;
 }
 
 pub async fn test_metastore_delete_index<

quickwit/quickwit-proto/protos/quickwit/search.proto

@@ -243,6 +243,10 @@ message SearchRequest {
   optional PartialHit search_after = 16;
 
   CountHits count_hits = 17;
+
+  // When an exact index_id is provided (not a pattern), the query fails if that
+  // index is missing and this is false.
+  bool ignore_missing_indexes = 18;
 }
 
 enum CountHits {

quickwit/quickwit-search/src/root.rs

@@ -366,6 +366,7 @@ fn simplify_search_request_for_scroll_api(req: &SearchRequest) -> crate::Result<
         // request is simplified after initial query, and we cache the hit count, so we don't need
         // to recompute it afterward.
         count_hits: quickwit_proto::search::CountHits::Underestimate as i32,
+        ignore_missing_indexes: req.ignore_missing_indexes,
     })
 }
 
@@ -1156,7 +1157,12 @@ async fn plan_splits_for_root_search(
         .deserialize_indexes_metadata()
         .await?;
 
-    check_all_index_metadata_found(&indexes_metadata[..], &search_request.index_id_patterns[..])?;
+    if !search_request.ignore_missing_indexes {
+        check_all_index_metadata_found(
+            &indexes_metadata[..],
+            &search_request.index_id_patterns[..],
+        )?;
+    }
 
     if indexes_metadata.is_empty() {
         return Ok((Vec::new(), HashMap::default()));
@@ -1243,7 +1249,12 @@ pub async fn search_plan(
         .deserialize_indexes_metadata()
         .await?;
 
-    check_all_index_metadata_found(&indexes_metadata[..], &search_request.index_id_patterns[..])?;
+    if !search_request.ignore_missing_indexes {
+        check_all_index_metadata_found(
+            &indexes_metadata[..],
+            &search_request.index_id_patterns[..],
+        )?;
+    }
     if indexes_metadata.is_empty() {
         return Ok(SearchPlanResponse {
             result: serde_json::to_string(&SearchPlanResponseRest {

quickwit/quickwit-serve/src/elasticsearch_api/model/multi_search.rs

@@ -25,6 +25,7 @@ use crate::simple_list::{from_simple_list, to_simple_list};
 
 // Multi search doc: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-multi-search.html
 
+#[serde_as]
 #[serde_with::skip_serializing_none]
 #[derive(Default, Debug, Serialize, Deserialize)]
 #[serde(deny_unknown_fields)]
@@ -50,6 +51,9 @@ pub struct MultiSearchQueryParams {
     pub ignore_throttled: Option<bool>,
     #[serde(default)]
     pub ignore_unavailable: Option<bool>,
+    #[serde_as(deserialize_as = "OneOrMany<_, PreferMany>")]
+    #[serde(default)]
+    pub index: Vec<String>,
     #[serde(default)]
     pub max_concurrent_searches: Option<u64>,
     #[serde(default)]
@@ -100,6 +104,26 @@ pub struct MultiSearchHeader {
     pub routing: Option<Vec<String>>,
 }
 
+impl MultiSearchHeader {
+    pub fn apply_query_param_defaults(&mut self, defaults: &MultiSearchQueryParams) {
+        if self.allow_no_indices.is_none() {
+            self.allow_no_indices = defaults.allow_no_indices;
+        }
+        if self.expand_wildcards.is_none() {
+            self.expand_wildcards = defaults.expand_wildcards.clone();
+        }
+        if self.ignore_unavailable.is_none() {
+            self.ignore_unavailable = defaults.ignore_unavailable;
+        }
+        if self.index.is_empty() {
+            self.index = defaults.index.clone();
+        }
+        if self.routing.is_none() {
+            self.routing = defaults.routing.clone();
+        }
+    }
+}
+
 #[derive(Serialize)]
 pub struct MultiSearchResponse {
     pub responses: Vec<MultiSearchSingleResponse>,

quickwit/quickwit-serve/src/elasticsearch_api/rest_handler.rs

@@ -358,6 +358,7 @@ fn build_request_for_es_api(
 
     let max_hits = search_params.size.or(search_body.size).unwrap_or(10);
     let start_offset = search_params.from.or(search_body.from).unwrap_or(0);
+    let ignore_missing_indexes = search_params.ignore_unavailable.unwrap_or(false);
     let count_hits = match search_params
         .track_total_hits
         .or(search_body.track_total_hits)
@@ -410,6 +411,7 @@ fn build_request_for_es_api(
             scroll_ttl_secs,
             search_after,
             count_hits,
+            ignore_missing_indexes,
         },
         has_doc_id_field,
     ))
@@ -814,13 +816,15 @@ async fn es_compat_index_multi_search(
     let mut payload_lines = str_lines(str_payload);
 
     while let Some(line) = payload_lines.next() {
-        let request_header = serde_json::from_str::<MultiSearchHeader>(line).map_err(|err| {
-            SearchError::InvalidArgument(format!(
-                "failed to parse request header `{}...`: {}",
-                truncate_str(line, 20),
-                err
-            ))
-        })?;
+        let mut request_header =
+            serde_json::from_str::<MultiSearchHeader>(line).map_err(|err| {
+                SearchError::InvalidArgument(format!(
+                    "failed to parse request header `{}...`: {}",
+                    truncate_str(line, 20),
+                    err
+                ))
+            })?;
+        request_header.apply_query_param_defaults(&multi_search_params);
         if request_header.index.is_empty() {
             return Err(ElasticsearchError::from(SearchError::InvalidArgument(
                 "`_msearch` request header must define at least one index".to_string(),

quickwit/quickwit-serve/src/search_api/rest_handler.rs

@@ -264,6 +264,7 @@ pub fn search_request_from_api_request(
         scroll_ttl_secs: None,
         search_after: None,
         count_hits: search_request.count_all.into(),
+        ignore_missing_indexes: false,
     };
     Ok(search_request)
 }

quickwit/rest-api-tests/scenarii/es_compatibility/0025-msearch.yaml

@@ -104,3 +104,25 @@ expected:
               $expect: "len(val) == 1" # Contains only 'actor'
               actor:
                 id: 5688
+---
+# test missing index
+endpoint: "_msearch"
+method: POST
+ndjson:
+  - {"index":"idontexist"}
+  - {"query" : {"match" : { "type": "PushEvent"}}, "size": 0}
+expected:
+  responses:
+    - status: 404
+---
+endpoint: "_msearch"
+method: POST
+ndjson:
+  - {"index":"idontexist", "ignore_unavailable": true}
+  - {"query" : {"match" : { "type": "PushEvent"}}, "size": 0}
+expected:
+  responses:
+    - hits:
+        total:
+          value: 0
+      status: 200

quickwit/rest-api-tests/scenarii/es_compatibility/multi-indices/0004-missing_index_query.yaml

@@ -0,0 +1,30 @@
+endpoint: "idontexist/_search"
+params:
+  q: "*"
+status_code: 404
+---
+endpoint: "idontexist/_search"
+params:
+  q: "*"
+  ignore_unavailable: "true"
+expected:
+  hits:
+    total:
+      value: 0
+---
+endpoint: "gharchive-*,idontexist/_search"
+params:
+  q: "*"
+status_code: 404
+---
+endpoint: "gharchive-*,idontexist/_search"
+params:
+  q: "*"
+  ignore_unavailable: "true"
+expected:
+  hits:
+    total:
+      value: 4
+
+
+