Added 2.6 release notes. (opensearch-project#809) (opensearch-project…

…#810)

Signed-off-by: Ashish Agrawal <[email protected]>
(cherry picked from commit db83a812606655cab076c6c9001adab30d380327)

Co-authored-by: Ashish Agrawal <[email protected]>

release-notes/opensearch-alerting.release-notes-2.6.0.0.md

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+## Version 2.6.0.0 2023-02-21
+Compatible with OpenSearch 2.6.0
+
+### Features
+* Multiple indices support in DocLevelMonitorInput ([#784](https://github.com/opensearch-project/alerting/pull/784))
+
+### Maintenance
+* [AUTO] Increment version to 2.6.0-SNAPSHOT ([#738](https://github.com/opensearch-project/alerting/pull/738))
+
+### Bug Fixes
+* Added document _id as param for terms query when searching alerts by their ids ([#753](https://github.com/opensearch-project/alerting/pull/753))
+* fix for ERROR alert state generation in doc-level monitors ([#768](https://github.com/opensearch-project/alerting/pull/768))
+* [BUG] ExecuteMonitor inserting metadata doc during dry run ([#758](https://github.com/opensearch-project/alerting/pull/758))
+* Adjusting max field index setting dynamically for query index ([#776](https://github.com/opensearch-project/alerting/pull/776))
+* Fix setting default title only when no subject has been set ([#750](https://github.com/opensearch-project/alerting/pull/750))
+
+### Infrastructure
+* fixed security tests. ([#484](https://github.com/opensearch-project/alerting/pull/484))
+* minot fix to prevent flaky tests in downstream plugins ([#804](https://github.com/opensearch-project/alerting/pull/804))
+* Publish snapshots to maven via GHA ([#805](https://github.com/opensearch-project/alerting/pull/805))
+
+### Documentation
+* Added 2.6 release notes. ([#809](https://github.com/opensearch-project/alerting/pull/809))