change CHANGELOG.md

Signed-off-by: Ruirui Zhang <[email protected]>

Author: ruai0511

CHANGELOG.md

@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ## [Unreleased 2.x]
 ### Added
 - MultiTermQueries in keyword fields now default to `indexed` approach and gated behind cluster setting ([#15637](https://github.com/opensearch-project/OpenSearch/pull/15637))
+- [Workload Management] Add Integration Tests for Workload Management CRUD APIs ([#15955](https://github.com/opensearch-project/OpenSearch/pull/15955))
 - [Workload Management] QueryGroup resource cancellation framework changes ([#15651](https://github.com/opensearch-project/OpenSearch/pull/15651))
 
 ### Dependencies