When doing a lot of changes on schemas and configurations, you may end up with a broken configuration of CloudView. The symptom was a search not working in GN4/Tark4 and partially working from the Exalead search interface (results were returned but only the header, no content and no fields).
The explaned procedure restores a valid configuration and requires an index rebuild.
The procedure is explained in Reset the CloudView configuration before applying a new configureindex.
See
Reset the CloudView configuration before applying a new configureindex