Added 2.9 release notes. (#486)

Signed-off-by: AWSHurneyt <[email protected]>
(cherry picked from commit 9a3213b)

release-notes/opensearch-security-analytics.release-notes-2.9.0.0.md

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+## Version 2.9.0.0 2023-07-11
+
+Compatible with OpenSearch 2.9.0
+
+### Maintenance
+* Increment version to 2.9.0-SNAPSHOT. ([#466](https://github.com/opensearch-project/security-analytics/pull/466))
+* Gradle update. ([#437](https://github.com/opensearch-project/security-analytics/pull/437))
+
+### Features
+* New Log Type JSON format. ([#465](https://github.com/opensearch-project/security-analytics/pull/465))
+* Correlation rule search, delete and edit API. ([#476](https://github.com/opensearch-project/security-analytics/pull/476))
+* Logtypes PR v2. ([#482](https://github.com/opensearch-project/security-analytics/pull/482))
+
+### Bug Fixes
+* Fixed compile issues related to latest OS core repo changes. ([#412](https://github.com/opensearch-project/security-analytics/pull/412))
+
+### Refactoring
+* Use strong password in security test. ([#452](https://github.com/opensearch-project/security-analytics/pull/452))
+
+### Documentation
+* Added 2.9.0 release notes. ([#486](https://github.com/opensearch-project/security-analytics/pull/486))