Ok, so I think you could apply the codex example as is:
function search_filter($query) {
if ( !is_admin() && $query->is_main_query() ) {
if ($query->is_search) {
$query->set('post_type', array( 'post', 'actualizacion', 'notificacion' ) );
}
}
}
add_action('pre_get_posts','search_filter');
I think you were just missing the !is_admin() check in there…
Hope this helps!
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