[Security] 9.1.4 release notes (#2917)

Resolves #2826: adds the
9.1.4 Security and Endpoint release notes.

Preview: [Elastic Security >
9.1.4](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/2917/release-notes/elastic-security#elastic-security-9.1.4-release-notes)

---------

Co-authored-by: Nicholas Berlin <[email protected]>
Co-authored-by: Visha Angelova <[email protected]>

Author: 3 people

release-notes/elastic-security/index.md

@@ -27,6 +27,16 @@ To check for security updates, go to [Security announcements for the Elastic sta
 
 % *
 
+## 9.1.4 [elastic-security-9.1.4-release-notes]
+
+### Features and enhancements [elastic-security-9.1.4-features-enhancements]
+* Adds more Linux diagnostic process `ptrace` events.
+
+### Fixes [elastic-security-9.1.4-fixes]
+* Fixes a bug where the toggle column functionality only functioned on the **Alerts** page [#234278]({{kib-pull}}234278).
+* Fixes a bug where Linux capabilities were included in {{elastic-endpoint}} network events despite being disabled.
+* Makes the delivery of {{elastic-endpoint}} command line commands more robust. In rare cases, commands could previously fail due to interprocess communication issues.
+
 ## 9.1.3 [elastic-security-9.1.3-release-notes]
 
 ### Fixes [elastic-security-9.1.3-fixes]