Updating CHANGELOG for next release (opensearch-project#701)

* Updating CHANGELOG for next release

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

* Change to date

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

---------

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

CHANGELOG.md

@@ -2,7 +2,23 @@
 Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ## [Unreleased 2.x]
 ### Added
+
+### Dependencies
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+## [2.8.0] - 01/11/2023
+### Added
 - Added support for indexing and search index settings ([#667](https://github.com/opensearch-project/opensearch-java/pull/667))
+- Added support for neural query type ([#674](https://github.com/opensearch-project/opensearch-java/pull/674))
 
 ### Dependencies
 
@@ -27,7 +43,6 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Added support for "script_fields" in multi search request ([#632](https://github.com/opensearch-project/opensearch-java/pull/632))
 - Added size attribute to MultiTermsAggregation ([#627](https://github.com/opensearch-project/opensearch-java/pull/627))
 - Added version increment workflow that executes after release ([#664](https://github.com/opensearch-project/opensearch-java/pull/664))
-- Added support for neural query type ([#674](https://github.com/opensearch-project/opensearch-java/pull/674))
 
 ### Dependencies
 - Bumps `org.ajoberstar.grgit:grgit-gradle` from 5.0.0 to 5.2.0
@@ -191,8 +206,8 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### Security
 
-
-[Unreleased 2.x]: https://github.com/opensearch-project/opensearch-java/compare/v2.7.0...2.x
+[Unreleased 2.x]: https://github.com/opensearch-project/opensearch-java/compare/v2.8.0...2.x
+[2.8.0]: https://github.com/opensearch-project/opensearch-java/compare/v2.7.0...v2.8.0
 [2.7.0]: https://github.com/opensearch-project/opensearch-java/compare/v2.6.0...v2.7.0
 [2.6.0]: https://github.com/opensearch-project/opensearch-java/compare/v2.5.0...v2.6.0
 [2.5.0]: https://github.com/opensearch-project/opensearch-java/compare/v2.4.0...v2.5.0