Preparing for 2.9.0 release (#870)

Signed-off-by: Vacha Shah <vachshah@amazon.com>

CHANGELOG.md

@@ -3,12 +3,29 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased 2.x]
 ### Added
+
+### Dependencies
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+## [2.9.0] - 02/22/2024
+### Added
 - Add support for Hybrid query type ([#850](https://github.com/opensearch-project/opensearch-java/pull/850))
 
 ### Dependencies
 - Bumps `org.ajoberstar.grgit:grgit-gradle` from 5.2.0 to 5.2.2
 
 ### Changed
+- Restore support for Java 8 ([#767](https://github.com/opensearch-project/opensearch-java/pull/767))
+- Add an integration test that runs on JDK-8 ([#795](https://github.com/opensearch-project/opensearch-java/pull/795))
 
 ### Deprecated
 
@@ -85,8 +102,6 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Dependencies
 
 ### Changed
-- Restore support for Java 8 ([#767](https://github.com/opensearch-project/opensearch-java/pull/767))
-- Add an integration test that runs on JDK-8 ([#795](https://github.com/opensearch-project/opensearch-java/pull/795))
 
 ### Deprecated