Updated changeLog

Signed-off-by: Wonjae Lee <[email protected]>

Author: leewjae

CHANGELOG.md

@@ -45,7 +45,7 @@ This section is for maintaining a changelog for all breaking changes for the cli
 ## [Unreleased 2.x]
 ### Added
 - Added `normalizer` to wildcard field ([#1489](https://github.com/opensearch-project/opensearch-java/pull/1489))
-
+- Updated OpenApi spec to reflect `HybridQuery` changes for version 2.19.0([#1490](https://github.com/opensearch-project/opensearch-java/pull/1490))
 ### Dependencies
 
 ### Changed