Add tests

Author: carlosdelest

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.vectors/40_knn_search.yml

@@ -670,3 +670,36 @@ setup:
           properties:
             embedding:
               type: dense_vector
+
+
+---
+"Searching with no data dimensions specified":
+  - requires:
+      cluster_features: "search.vectors.no_dimensions_bugfix"
+      reason: "Search with no dimensions bugfix"
+
+  - do:
+      indices.create:
+        index: empty-test
+        body:
+          mappings:
+            properties:
+              vector:
+                type: dense_vector
+                index: true
+
+  - do:
+      search:
+        index: empty-test
+        body:
+          fields: [ "name" ]
+          knn:
+            field: vector
+            query_vector: [ -0.5, 90.0, -10, 14.8, -156.0 ]
+            k: 3
+            num_candidates: 3
+            rescore_vector:
+              oversample: 1.5
+            similarity: 0.1
+
+  - match: { hits.total.value: 0 }

server/src/main/java/org/elasticsearch/search/SearchFeatures.java

@@ -32,6 +32,7 @@ public Set<NodeFeature> getFeatures() {
     public static final NodeFeature INT_SORT_FOR_INT_SHORT_BYTE_FIELDS = new NodeFeature("search.sort.int_sort_for_int_short_byte_fields");
     static final NodeFeature MULTI_MATCH_CHECKS_POSITIONS = new NodeFeature("search.multi.match.checks.positions");
     public static final NodeFeature BBQ_HNSW_DEFAULT_INDEXING = new NodeFeature("search.vectors.mappers.default_bbq_hnsw");
+    public static final NodeFeature SEARCH_WITH_NO_DIMENSIONS_BUGFIX = new NodeFeature("search.vectors.no_dimensions_bugfix");
 
     @Override
     public Set<NodeFeature> getTestFeatures() {
@@ -41,7 +42,8 @@ public Set<NodeFeature> getTestFeatures() {
             RESCORER_MISSING_FIELD_BAD_REQUEST,
             INT_SORT_FOR_INT_SHORT_BYTE_FIELDS,
             MULTI_MATCH_CHECKS_POSITIONS,
-            BBQ_HNSW_DEFAULT_INDEXING
+            BBQ_HNSW_DEFAULT_INDEXING,
+            SEARCH_WITH_NO_DIMENSIONS_BUGFIX
         );
     }
 }