[Obs AI Assistant] Query remote indices by default (elastic#193462)

Query `[ '*', '*:*' ]` by default when listing indices.

Co-authored-by: Elastic Machine <[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 = [