2.2 release notes (#631)

Signed-off-by: Amit Galitzky <[email protected]>
(cherry picked from commit 01bbfc5)

release-notes/opensearch-anomaly-detection.release-notes-2.2.0.0.md

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+## Version 2.2.0.0 Release Notes
+
+Compatible with OpenSearch 2.2.0
+
+
+### Enhancements
+
+* make 1M1min possible ([#620](https://github.com/opensearch-project/anomaly-detection/pull/620))
+
+### Infrastructure
+
+* fix zip fetching issue on version increment ([#611](https://github.com/opensearch-project/anomaly-detection/pull/611))
+* Staging for version increment automation ([#608](https://github.com/opensearch-project/anomaly-detection/pull/608))
+* Update BWC zip links ([#625](https://github.com/opensearch-project/anomaly-detection/pull/625))
+
+### Maintenance
+
+* Bump version to 2.2 ([#627](https://github.com/opensearch-project/anomaly-detection/pull/627))