Flat object field should delegate to keyword field for most query types

Signed-off-by: kkewwei <[email protected]>

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - [Workload Management] QueryGroup resource cancellation framework changes ([#15651](https://github.com/opensearch-project/OpenSearch/pull/15651))
 - Fallback to Remote cluster-state on Term-Version check mismatch - ([#15424](https://github.com/opensearch-project/OpenSearch/pull/15424))
 - Implement WithFieldName interface in ValuesSourceAggregationBuilder & FieldSortBuilder ([#15916](https://github.com/opensearch-project/OpenSearch/pull/15916))
+- Flat object field use IndexOrDocValuesQuery to optimize query ([#14383](https://github.com/opensearch-project/OpenSearch/issues/14383))
 
 ### Dependencies
 - Bump `com.azure:azure-identity` from 1.13.0 to 1.13.2 ([#15578](https://github.com/opensearch-project/OpenSearch/pull/15578))

rest-api-spec/src/main/resources/rest-api-spec/test/index/90_flat_object.yml

@@ -627,38 +627,6 @@ teardown:
   - match: { error.root_cause.0.reason: "Mapping definition for [data] has unsupported parameters:  [analyzer : standard]"}
   - match: { status: 400 }
 
-  # Wildcard Query with dot path.
-  - do:
-      catch: bad_request
-      search:
-        body: {
-          _source: true,
-          query: {
-            "wildcard": {
-              "catalog.title": "Mock*"
-            }
-          }
-        }
-  - match: { error.root_cause.0.type: "query_shard_exception" }
-  - match: { error.root_cause.0.reason: "Can only use wildcard queries on keyword and text fields - not on [catalog.title] which is of type [flat_object]"}
-  - match: { status: 400 }
-
-  # Wildcard Query without dot path.
-  - do:
-      catch: bad_request
-      search:
-        body: {
-          _source: true,
-          query: {
-            "wildcard": {
-              "catalog": "Mock*"
-            }
-          }
-        }
-  - match: { error.root_cause.0.type: "query_shard_exception" }
-  - match: { error.root_cause.0.reason: "Can only use wildcard queries on keyword and text fields - not on [catalog] which is of type [flat_object]" }
-  - match: { status: 400 }
-
   # Aggregation and Match Query with dot path.
   - do:
       catch: bad_request