Go to cgi-bin/koha/admin/searchengine/elasticsearch/mappings.pl#search_fields_panel the search field on the top of the table does not work for this tab "Search fields" If you search for example for author the list is empty go to the next tab "Bibliographic Records" cgi-bin/koha/admin/searchengine/elasticsearch/mappings.pl#mapping_biblios_panel Check that the search field works fine here. The same on the tab Authorities (#mapping_authorities_panel). The problem exists only for the panel search_fields.