[Security] 9.1.1 release notes

Author: natasha-moore-elastic

release-notes/elastic-security/index.md

@@ -27,6 +27,13 @@ To check for security updates, go to [Security announcements for the Elastic sta
 
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+## 9.1.1 [elastic-security-9.1.1-release-notes]
+
+### Fixes [elastic-security-9.1.1-fixes]
+* Fixes a bug by moving the `scheduleNow` call to the privileged monitoring engine initialization step, ensuring the task is only scheduled after the engine is fully created and ready [#230263]({{kib-pull}}230263).
+* Fixes a bug where the base version API route cache was not properly invalidated after rule import [#228475]({{kib-pull}}228475).
+
+
 ## 9.1.0 [elastic-security-9.1.0-release-notes]
 
 ### Features and enhancements [elastic-security-9.1.0-features-enhancements]