[8.x] [Obs AI Assistant] Query remote indices by default (elastic#193462

) (elastic#201399)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Obs AI Assistant] Query remote indices by default
(elastic#193462)](elastic#193462)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Co-authored-by: Dario Gieselaar <[email protected]>

x-pack/plugins/observability_solution/observability_ai_assistant/server/functions/get_dataset_info/index.ts

@@ -48,7 +48,7 @@ export function registerGetDatasetInfoFunction({
 
       try {
         const body = await esClient.asCurrentUser.indices.resolveIndex({
-          name: index === '' ? '*' : index.split(','),
+          name: index === '' ? ['*', '*:*'] : index.split(','),
           expand_wildcards: 'open',
         });
         indices = [