Extracted change set from #18487

Author: andsel

docs/release-notes/index.md

@@ -21,9 +21,31 @@ To check for security updates, go to [Security announcements for the Elastic sta
 % ### Fixes [logstash-next-fixes]
 % *
 
-## 9.1.9 [logstash-9.1.9-release-notes]
+# 9.1.9 [logstash-9.1.9-release-notes]
 
-No user-facing changes in Logstash core and plugins.
+### Features and enhancements [logstash-9.1.9-features-enhancements]
+
+---------- GENERATED CONTENT STARTS HERE ------------
+=== Logstash Pull Requests with label v9.1.9
+
+=== Logstash Commits between 9.1 and 9.1.8
+
+Computed with "git log --pretty=format:'%h -%d %s (%cr) <%an>' --abbrev-commit --date=relative v9.1.8..9.1"
+
+33a62d1cc - (HEAD -> 9.1, origin/9.1) Include pipeline and plugin IDs to the JSON logs. (#18470) (#18473) (2 days ago) <mergify[bot]>
+7bc74ba61 - [9.1] (backport #18423) Rewrite Env2yaml in java instead of Go (#18457) (5 days ago) <mergify[bot]>
+26d47d588 - Upgrade sinatra to 4.2.1 (#18469) (5 days ago) <Mashhur>
+a2504c811 - Doc: Add elastic-integration filter tutorial (#18229) (#18461) (6 days ago) <mergify[bot]>
+7946f7cc9 - (origin/mergify/bp/9.1/pr-18446) Bump logstash version 9.1.9 (#18453) (9 days ago) <github-actions[bot]>
+e4d32ac42 - Release notes for 9.1.8 (#18446) (9 days ago) <github-actions[bot]>
+
+=== Logstash Plugin Release Changelogs ===
+Computed from "git diff v9.1.8..9.1 *.release"
+Changed plugin versions:
+---------- GENERATED CONTENT ENDS HERE ------------
+
+
+### Plugins [logstash-plugin-9.1.9-changes]
 
 ## 9.1.8 [logstash-9.1.8-release-notes]