I would like to be able to have custom search result pages for each of my custom post type. The index content would be custom fields. For instance, the custom field could be a zipcode 28801. There would be generic results for everything with that zipcode.
/?=28801
Or the custom post type results:
/schools/?=28801
/libraries/?=28801
Well, I believe you would first need some sort of custom permalink handler function, or .htaccess mod_rewrite rules to translate the pages to query parameters, as I am not sure if WordPress supports multiple search results pages like that.
Then very likely the plugin code would have to be modified according to these rules. You might have to ask a developer about this. I usually suggest looking on Envato Studio: https://studio.envato.com