Add PR link to change log.

Signed-off-by: Bo Zhang <“[email protected]”>

CHANGELOG.md

@@ -9,7 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Set neural-search plugin 3.0.0 baseline JDK version to JDK-21 ([#838](https://github.com/opensearch-project/neural-search/pull/838))
 - Support different embedding types in model's response ([#1007](https://github.com/opensearch-project/neural-search/pull/1007))
 ### Bug Fixes
-- Fix a bug to unflatten the doc with list of map with multiple entries correctly.
+- Fix a bug to unflatten the doc with list of map with multiple entries correctly ([#1204](https://github.com/opensearch-project/neural-search/pull/1204)).
 ### Infrastructure
 - [3.0] Update neural-search for OpenSearch 3.0 compatibility ([#1141](https://github.com/opensearch-project/neural-search/pull/1141))
 ### Documentation