[BUG] Console autocomplete does not work if a user only has access to some indices

[bladerail]

Describe the bug
In the Dev Tools Console, a User with restricted indices permissions will not get autocomplete.

I created a new Opensearch and Opensearch Dashboards instance, used the admin user to create 3 indices: abc, abc_123 and def.

I created a new role named my_role and granted it no cluster permissions, but with index permissions indices_all to index pattern ["abc*"].

I created a new user named dev and assigned it to the role my_role.

Expected behavior
Autocomplete should appear for abc, abc_123 but not for def.

Actual behavior
I get no autocomplete at all.

OpenSearch Version
2.11.1

Dashboards Version
2.11.1

Plugins
Nil

Screenshots
Configured permissions for the role my_role.

Logs show that the dev user is trying to get mapping for all indices (*)

Host/Environment (please complete the following information):

• OS: Opensearch and Opensearch-Dashboards docker images in a Windows Host running Docker Desktop
• Browser and version Chrome version 122.0.6261.71

Additional context
If I replace abc* with just *, autocomplete works. If I put every single index from _cat/indices into that list, it works. If I remove def, autocomplete no longer works.

From my preliminary investigation, the autocomplete is derived from doing a GET _mappings API call, which returns the mappings for all indices. This API call returns 403 as long as the user does not have indices:admin/mappings/get for a single index.

I'm not sure if this should be fixed by Opensearch or Opensearch-Dashboards.