Hi @itssrinadh,
The Community Edition has many fewer roles than the Enterprise Edition, and we do know that the documentation doesn’t do a good job explaining the difference (Loading...).
The error message is definitely incorrect for the Community Edition, I filed an issue to fix that: Loading...
For creating indexes, it should be possible with either “Admin” or “Bucket Full Access”. You don’t want to click “Read Only Admin” since that role can’t do anything.
The error that you posted does show up if you try to run a query with no credentials at all. Are you sure that you are including credentials with the HTTP request?