Adding release notes for 2.8 (#323) (#324)

Signed-off-by: Martin Gaievski <gaievski@amazon.com>
(cherry picked from commit 78e4005)

Co-authored-by: Martin Gaievski <gaievski@amazon.com>

CHANGELOG.md

@@ -12,13 +12,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Maintenance
 ### Refactoring
 
-## [Unreleased 2.x](https://github.com/opensearch-project/geospatial/compare/2.7...2.x)
+## [Unreleased 2.x](https://github.com/opensearch-project/geospatial/compare/2.8...2.x)
 ### Features
 ### Enhancements
 ### Bug Fixes
 ### Infrastructure
-* Make jacoco report to be generated faster in local ([#267](https://github.com/opensearch-project/geospatial/pull/267))
-* Exclude lombok generated code from jacoco coverage report ([#268](https://github.com/opensearch-project/geospatial/pull/268))
 ### Documentation
 ### Maintenance
 ### Refactoring

release-notes/opensearch-geospatial.release-notes-2.8.0.0.md

@@ -0,0 +1,10 @@
+## Version 2.8.0.0 Release Notes
+
+Compatible with OpenSearch 2.8.0
+
+### Infrastructure
+* Make jacoco report to be generated faster in local ([#267](https://github.com/opensearch-project/geospatial/pull/267))
+* Exclude lombok generated code from jacoco coverage report ([#268](https://github.com/opensearch-project/geospatial/pull/268))
+
+### Maintenance
+* Change package for Strings.hasText ([#314](https://github.com/opensearch-project/geospatial/pull/314))