changelog

Signed-off-by: Yupeng Fu <[email protected]>

Author: yupeng9

CHANGELOG.md

@@ -57,6 +57,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - [WLM] Rename QueryGroup to WorkloadGroup ([#17901](https://github.com/opensearch-project/OpenSearch/pull/17901))
 - Relaxes jarHell check for optionally extended plugins([#17893](https://github.com/opensearch-project/OpenSearch/pull/17893)))
 - Add cluster setting for retry timeout of publish checkpoint tx action ([#17749](https://github.com/opensearch-project/OpenSearch/pull/17749))
+- Update API of Message in index to add the timestamp for lag calculation in ingestion polling ([#17977]https://github.com/opensearch-project/OpenSearch/pull/17977/)
 
 ### Dependencies
 - Bump `com.nimbusds:nimbus-jose-jwt` from 9.41.1 to 10.0.2 ([#17607](https://github.com/opensearch-project/OpenSearch/pull/17607), [#17669](https://github.com/opensearch-project/OpenSearch/pull/17669))