Update OpenSearch version in advanced search documentation to 2.19 for consistency across self-hosting guides.

Author: akshat5302

docs/self-hosting/govern/advanced-search.md

@@ -12,7 +12,7 @@ Plane uses OpenSearch to provide advanced search capabilities across your worksp
 
 You'll need:
 
-- An OpenSearch 2.x instance (self-hosted or managed service like AWS OpenSearch).
+- An OpenSearch 2.19 instance (self-hosted or managed service like AWS OpenSearch).
 
 ## What you get with advanced search
 

docs/self-hosting/govern/plane-ai.md

@@ -14,7 +14,7 @@ For an overview of what Plane AI can do, see the [Plane AI](https://docs.plane.s
 
 You'll need:
 
-- An OpenSearch 2.x instance (self-hosted or AWS OpenSearch) configured for [advanced search](/self-hosting/govern/advanced-search).
+- An OpenSearch 2.19 instance (self-hosted or AWS OpenSearch) configured for [advanced search](/self-hosting/govern/advanced-search).
 - At least one LLM provider API key or a custom OpenAI-compatible endpoint.
 - At least one embedding model configured in OpenSearch.
 

docs/self-hosting/methods/airgapped-edition-kubernetes.md

@@ -88,8 +88,11 @@ Consider these alternatives:
    airgapped:
      enabled: true # Must be TRUE for airgapped installations
      # If using custom root CA for S3 storage
-     s3SecretName: "s3-custom-ca"
-     s3SecretKey: "s3-custom-ca.crt"
+     s3Secrets:
+      - name: plane-s3-ca
+        key: s3-custom-ca.crt
+      - name: plane-s3-ca-2
+        key: s3-custom-ca-2.crt
    ```
 
    **Service images:**