Add missed changelog entry (opensearch-project#1597)

Signed-off-by: Thomas Farr <[email protected]>

Author: Xtansia

CHANGELOG.md

@@ -21,6 +21,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added support for the `template` query type ([#1586](https://github.com/opensearch-project/opensearch-java/pull/1586))
 - Added support for Search Shards request `slice` property ([#1586](https://github.com/opensearch-project/opensearch-java/pull/1586))
 - Added support for ML tool attributes ([#1594](https://github.com/opensearch-project/opensearch-java/pull/1594))
+- Added support for the `score-ranker-processor` phase results processor ([#1594](https://github.com/opensearch-project/opensearch-java/pull/1594))
 
 ### Dependencies
 - Bump `org.junit:junit-bom` from 5.12.2 to 5.13.0 ([#1587](https://github.com/opensearch-project/opensearch-java/pull/1587))