Flip SEARCH_PIPELINE feature flag for search pipeline GA

Signed-off-by: Louis Chu <clingzhi@amazon.com>

CHANGELOG.md

@@ -103,6 +103,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Support transport action names when registering NamedRoutes ([#7957](https://github.com/opensearch-project/OpenSearch/pull/7957))
 - Create concept of persistent ThreadContext headers that are unstashable ([#8291]()https://github.com/opensearch-project/OpenSearch/pull/8291)
 - Enable Partial Flat Object ([#7997](https://github.com/opensearch-project/OpenSearch/pull/7997))
+- Introduce full support for Search Pipeline ([#8513](https://github.com/opensearch-project/OpenSearch/pull/8513))
 
 ### Dependencies
 - Bump `com.azure:azure-storage-common` from 12.21.0 to 12.21.1 (#7566, #7814)
@@ -181,4 +182,4 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Security
 
 [Unreleased 3.0]: https://github.com/opensearch-project/OpenSearch/compare/2.x...HEAD
-[Unreleased 2.x]: https://github.com/opensearch-project/OpenSearch/compare/2.8...2.x
+[Unreleased 2.x]: https://github.com/opensearch-project/OpenSearch/compare/2.8...2.x

server/src/main/java/org/opensearch/common/util/FeatureFlags.java

@@ -106,7 +106,7 @@ public static boolean isEnabled(String featureFlagName) {
 
     public static final Setting<Boolean> EXTENSIONS_SETTING = Setting.boolSetting(EXTENSIONS, false, Property.NodeScope);
 
-    public static final Setting<Boolean> SEARCH_PIPELINE_SETTING = Setting.boolSetting(SEARCH_PIPELINE, false, Property.NodeScope);
+    public static final Setting<Boolean> SEARCH_PIPELINE_SETTING = Setting.boolSetting(SEARCH_PIPELINE, true, Property.NodeScope);
 
     public static final Setting<Boolean> IDENTITY_SETTING = Setting.boolSetting(IDENTITY, false, Property.NodeScope);