Release notes for 1.13.1 (#676)

* release notes for 1.13.1

release-notes/opendistro-for-elasticsearch-release-notes-1.13.1.md

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+# Open Distro for Elasticsearch 1.13.1 Release Notes
+
+## Release Highlights
+Open Distro for Elasticsearch 1.13.0 was shipped without the Performance Analyzer active in TAR and Docker formats. Additionally, the security plugin included in 1.13.0 threw errors on _cat/health calls and introduced a performance regression when compared to 1.12.0. Version 1.13.1 was released on March 4th, 2021 to re-enable Performance Analyzer as well as resolve the error and the performance regression in the security plugin.
+
+## Release Details
+Open Distro for Elasticsearch 1.13.1 includes the following bug fixes and maintenance updates.
+
+## BUG FIXES
+
+### Security
+* Fix for "java.lang.IllegalArgumentException: The array of keys must not be null" for "_cat/health" requests ([#1048](https://github.com/opendistro-for-elasticsearch/security/pull/1048))
+* Revert "Fix AuthCredentials equality (#876)" to improve performance ([#1061](https://github.com/opendistro-for-elasticsearch/security/pull/1061))
+
+### Release Engineering
+* Bug fix for Performance Analyzer plugin in TAR and Docker ([#649](https://github.com/opendistro-for-elasticsearch/opendistro-build/pull/649))
+
+
+## MAINTENANCE
+
+### Security
+* Bump version to 1.13.1.0 ([#1054](https://github.com/opendistro-for-elasticsearch/security/pull/1054))
+* Update release notes 1.13.1 ([#1063](https://github.com/opendistro-for-elasticsearch/security/pull/1063))
+
+### Alerting
+* Bump version to 1.13.1.0 ([#358](https://github.com/opendistro-for-elasticsearch/alerting/pull/358))
+
+### Index Management
+* Bump version to 1.13.1.0 ([#411](https://github.com/opendistro-for-elasticsearch/index-management/pull/411))
+
+