2.1 release note (opensearch-project#405)

Signed-off-by: bowenlan-amzn <bowenlan23@gmail.com>

release-notes/opensearch-index-management.release-notes-2.1.0.0.md

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+## Version 2.1.0.0 2022-07-06
+
+Compatible with OpenSearch 2.1.0
+
+### Features
+* Merge snapshot management into main branch ([#390](https://github.com/opensearch-project/index-management/pull/390))
+* Adds snapshot management notification implementation ([#387](https://github.com/opensearch-project/index-management/pull/387))
+* Snapshot management default date format in snapshot name ([#392](https://github.com/opensearch-project/index-management/pull/392))
+
+### Enhancements
+* Bump mapping schema version ([#394](https://github.com/opensearch-project/index-management/pull/394))
+* Clean the mapping update log in SMStateMachine ([#396](https://github.com/opensearch-project/index-management/pull/396))
+
+### Bug Fixes
+* BWC for rollover skip, restricted index pattern ([#371](https://github.com/opensearch-project/index-management/pull/371))
+
+### Infrastructure
+* Uses custom plugin to publish zips to maven ([#366](https://github.com/opensearch-project/index-management/pull/366))
+
+### Documentation
+* Updated issue templates from .github. ([#324](https://github.com/opensearch-project/index-management/pull/324))
+
+### Maintenance
+* version upgrade to 2.1.0 ([#389](https://github.com/opensearch-project/index-management/pull/389))