Release notes for 9.1.3 (#18029) (#18174)

* Update release notes for 9.1.3

* Refine 9.1.3 release notes.

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(cherry picked from commit 6c9ea7c)

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

Author: 4 people

docs/release-notes/index.md

@@ -20,6 +20,15 @@ To check for security updates, go to [Security announcements for the Elastic sta
 
 % ### Fixes [logstash-next-fixes]
 % *
+## 9.1.3 [logstash-9.1.3-release-notes]
+
+### Features and enhancements [logstash-9.1.3-features-enhancements]
+
+* Logging improvement while handling exceptions in the pipeline, ensuring that chained exceptions propagate enough information to be actionable. [#17935](https://github.com/elastic/logstash/pull/17935)
+
+### Plugins [logstash-plugin-9.1.3-changes]
+
+No change to the plugins in this release.
 
 ## 9.1.2 [logstash-9.1.2-release-notes]