Remove certificates from internal search results

[ruthpozuelo]

Is your feature request related to a problem? Please describe

Certificates appear on internal search results and clutter them.

Describe the solution you'd like

Remove the certificates from appearing on search

Describe alternatives you've considered

I have removed them adding this code to my theme, but if I ever want to delete the plugin it will crash my site.

//*Remove/Exclude certificates pages from search
function remove_pages_from_search() {
global $wp_post_types;
$wp_post_types['certificate']->exclude_from_search = true;
}
add_action('wp_loaded', 'remove_pages_from_search');

Additional context