Added 2.11 release notes. (opensearch-project#660)

* Added 2.11 release notes.

Signed-off-by: AWSHurneyt <hurneyt@amazon.com>

* Added 2.11 release notes.

Signed-off-by: AWSHurneyt <hurneyt@amazon.com>

---------

Signed-off-by: AWSHurneyt <hurneyt@amazon.com>

release-notes/opensearch-security-analytics.release-notes-2.11.0.0.md

@@ -0,0 +1,28 @@
+## Version 2.11.0.0 2023-10-11
+
+Compatible with OpenSearch 2.11.0
+
+### Maintenance
+* Bump version to 2.11. ([#631](https://github.com/opensearch-project/security-analytics/pull/631))
+
+### Enhancements
+* Adds support for alerts and triggers on group by based sigma rules. ([#545](https://github.com/opensearch-project/security-analytics/pull/545))
+* Auto expand replicas. ([#547](https://github.com/opensearch-project/security-analytics/pull/547))
+* Auto expand replicas for logtype index. ([#568](https://github.com/opensearch-project/security-analytics/pull/568))
+* Adding WAF Log type. ([#617](https://github.com/opensearch-project/security-analytics/pull/617))
+* Add category to custom log types. ([#634](https://github.com/opensearch-project/security-analytics/pull/634))
+
+### Refactoring
+* Address search request timeouts as transient error. ([#561](https://github.com/opensearch-project/security-analytics/pull/561))
+* Change ruleId if it exists. ([#628](https://github.com/opensearch-project/security-analytics/pull/628))
+
+### Bug Fixes
+* Fixes verifying workflow test when security is enabled. ([#563](https://github.com/opensearch-project/security-analytics/pull/563))
+* Fix flaky integration tests. ([#581](https://github.com/opensearch-project/security-analytics/pull/581))
+* Sigma Aggregation rule fixes. ([#622](https://github.com/opensearch-project/security-analytics/pull/622))
+
+### Infrastructure
+* Ignore tests that may be flaky. ([#596](https://github.com/opensearch-project/security-analytics/pull/596))
+
+### Documentation
+* Added 2.11.0 release notes. ([#660](https://github.com/opensearch-project/security-analytics/pull/660))