Updating required cluster feature for knn queries using k parameter (#120466)

Author: pmpailis

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.vectors/130_knn_query_nested_search.yml

@@ -1,7 +1,7 @@
 setup:
   - requires:
-      cluster_features: "gte_v8.12.0"
-      reason: 'knn as query added in 8.12'
+      cluster_features: "search.vectors.k_param_supported"
+      reason: 'k param for knn as query is required'
   - do:
       indices.create:
         index: test

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.vectors/140_knn_query_with_other_queries.yml

@@ -1,8 +1,8 @@
 # test how knn query interact with other queries
 setup:
   - requires:
-      cluster_features: "gte_v8.12.0"
-      reason: 'knn as query added in 8.12'
+      cluster_features: "search.vectors.k_param_supported"
+      reason: 'k param for knn as query is required'
       test_runner_features: close_to
 
   - do:

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.vectors/160_knn_query_missing_params.yml

@@ -1,7 +1,7 @@
 setup:
   - requires:
-      cluster_features: "gte_v8.13.0"
-      reason: '[k] and [num_candidates] were made optional for kNN query in 8.13.0'
+      cluster_features: "search.vectors.k_param_supported"
+      reason: 'k param for knn as query is required'
   - do:
       indices.create:
         index: knn_query_test_index

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.vectors/180_update_dense_vector_type.yml

@@ -1,7 +1,7 @@
 setup:
   - requires:
-      cluster_features: "gte_v8.15.0"
-      reason: 'updatable dense vector field types was added in 8.15'
+      cluster_features: "search.vectors.k_param_supported"
+      reason: 'k param for knn as query is required'
   - requires:
       test_runner_features: [ contains ]
 ---