add change log

CHANGELOG.md

@@ -108,7 +108,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Fix unchecked cast in dynamic action map getter ([#15394](https://github.com/opensearch-project/OpenSearch/pull/15394))
 - Fix null values indexed as "null" strings in flat_object field ([#14069](https://github.com/opensearch-project/OpenSearch/pull/14069))
 - Fix terms query on wildcard field returns nothing ([#15607](https://github.com/opensearch-project/OpenSearch/pull/15607))
-
+- Fix wildcard query containing escaped character ([#15737](https://github.com/opensearch-project/OpenSearch/pull/15737))
 ### Security
 
 [Unreleased 2.x]: https://github.com/opensearch-project/OpenSearch/compare/2.15...2.x