Added 2.7 release notes. (#755)

* Added 2.7 release notes.

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

* Added 2.7 release notes.

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

---------

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

release-notes/opensearch-index-management.release-notes-2.7.0.0.md

@@ -0,0 +1,24 @@
+## Version 2.7.0.0 2023-04-17
+
+Compatible with OpenSearch 2.7.0
+
+### Maintenance
+* Bump mockito version. ([#701](https://github.com/opensearch-project/index-management/pull/701))
+* Bump version to 2.7. ([#743](https://github.com/opensearch-project/index-management/pull/743))
+
+### Features
+* Error Prevention: Add close action. ([#728](https://github.com/opensearch-project/index-management/pull/728))
+* Error Prevention: Add index priority action. ([#729](https://github.com/opensearch-project/index-management/pull/729))
+* Error Prevention: Add notification, shrink, allocation and rollup. ([#732](https://github.com/opensearch-project/index-management/pull/732))
+* Error Prevention: Add transition action. ([#744](https://github.com/opensearch-project/index-management/pull/744))
+* Error Prevention: Add snapshot action. ([#745](https://github.com/opensearch-project/index-management/pull/745))
+
+### Refactoring
+* Replace Set in org.opensearch.common.collect with java.util references. ([#717](https://github.com/opensearch-project/index-management/pull/717))
+* Fixed xContent dependencies due to OSCore changes. ([#721](https://github.com/opensearch-project/index-management/pull/721))
+
+### Bug fixes
+* Shrink action Fix. ([#718](https://github.com/opensearch-project/index-management/pull/718))
+
+### Documentation
+* Added 2.7 release notes. ([#755](https://github.com/opensearch-project/index-management/pull/755))