Add changelog

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

CHANGELOG.md

@@ -13,6 +13,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Update literature around changelog contributions in CONTRIBUTING.md ([#242](https://github.com/opensearch-project/opensearch-java/pull/242))
 - Update tests to use JUnit's Assert ([#244](https://github.com/opensearch-project/opensearch-java/pull/244))
 - Add support to parse sub-aggregations from filter/nested aggregations ([#234](https://github.com/opensearch-project/opensearch-java/pull/234))
+- Add timeout and throttle to the jenkins workflows ([#231](https://github.com/opensearch-project/opensearch-java/pull/231)) 
 
 ### Deprecated
 
@@ -23,4 +24,4 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Security
 
 
-[Unreleased]: https://github.com/opensearch-project/opensearch-java/compare/2.0...HEAD
+[Unreleased]: https://github.com/opensearch-project/opensearch-java/compare/2.0...HEAD