Added 2.7 release notes. (opensearch-project#864) (opensearch-project…

…#872)

* Added 2.7 release notes.

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

* 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>
(cherry picked from commit 6e94ee23ba9967d95afb1fe075457abd949c1688)

Co-authored-by: AWSHurneyt <hurneyt@amazon.com>

release-notes/opensearch-alerting.release-notes-2.7.0.0.md

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+## Version 2.7.0.0 2023-04-17
+Compatible with OpenSearch 2.7.0
+
+### Maintenance
+* Increment version to 2.7. ([#823](https://github.com/opensearch-project/alerting/pull/823))
+
+### Refactoring
+* Revert enabled field in source_to_query_index_mapping. ([#812](https://github.com/opensearch-project/alerting/pull/812))
+* Fixed xContent dependencies due to OSCore changes. ([#839](https://github.com/opensearch-project/alerting/pull/839))
+* Update config index schema if needed at the start of each monitor execution. ([#849](https://github.com/opensearch-project/alerting/pull/849))
+
+### Bug Fixes
+* Issue with percolate query transforming documents with object type fields. ([#844](https://github.com/opensearch-project/alerting/issues/844))
+* Notification security fix. ([#852](https://github.com/opensearch-project/alerting/pull/852))
+
+### Infrastructure
+* Use notification snapshot for integ test. ([#822](https://github.com/opensearch-project/alerting/pull/822))
+* Use latest common-utils snapshot. ([#858](https://github.com/opensearch-project/alerting/pull/858))
+
+### Documentation
+* Added 2.7 release notes. ([#864](https://github.com/opensearch-project/alerting/pull/864))