Add release notes for 1.2.2 (#1348)

Signed-off-by: Sayali Gaikawad <gaiksaya@amazon.com>

Author: gaiksaya

release-notes/opensearch-release-notes-1.2.2.md

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+# OpenSearch 1.2.1 Release Notes
+
+## Release Highlights
+
+This patch releases updates the version of Log4j used in OpenSearch to Log4j 2.16.0 as recommended by the advisory in [CVE-2021-45046](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-45046).
+
+### OpenSearch
+* Increment version to 1.2.2 and backport log4j upgrade to 2.16. ([#1728](https://github.com/opensearch-project/OpenSearch/pull/1728))
+
+### OpenSearch Security
+* Bumping log4j to 2.16.0 ([#1525](https://github.com/opensearch-project/security/pull/1525))
+