I have tried updating search_request.xml but no effect.
Tried using https://gist.github.com/anonymous/225c498e81565fd6d6a3de670c008593, but still no effect.
Reference : https://phpstack-773794-2925372.cloudwaysapps.com/engagement-rings
Showing products upto 250 pages only. And error "We can't find products matching the selection" on all next pages.