[main] (backport #18247) Release notes for 9.0.8 (#18270)

* Release notes for 9.0.8 (#18247)

* Update release notes for 9.0.8

* finalize release notes

* Update docs/release-notes/index.md

Co-authored-by: Karen Metts <[email protected]>

---------

Co-authored-by: logstashmachine <[email protected]>
Co-authored-by: donoghuc <[email protected]>
Co-authored-by: Karen Metts <[email protected]>
(cherry picked from commit 82ff1f7)

* fix merge conflicts

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: logstashmachine <[email protected]>
Co-authored-by: donoghuc <[email protected]>
Co-authored-by: Karen Metts <[email protected]>

Author: 5 people

docs/release-notes/index.md

@@ -199,6 +199,16 @@ The Elasticsearch Input now provides [support](https://github.com/logstash-plugi
 **Tcp Output - 7.0.1**
 
 * Call connection check after connect [#61](https://github.com/logstash-plugins/logstash-output-tcp/pull/61)
+## 9.0.8 [logstash-9.0.8-release-notes]
+
+No user-facing changes in Logstash core.
+
+### Plugins [logstash-plugin-9.0.8-changes]
+
+**Elasticsearch Output - 12.0.7**
+
+* Support both, encoded and non-encoded api-key formats on plugin configuration [#1223](https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1223)
+
 
 ## 9.0.7 [logstash-9.0.7-release-notes]