ECPT Query Filters

ecpt_query_filters.php

<?php

function ecpt_include_post_types_in_search($query) {
	if( $query->is_main_query() && is_search() && $query->query_vars['post_type'] != 'nav_menu_item' ) {
		$post_types = get_post_types(array('exclude_from_search' => false), 'objects');
		$searchable_types = array();
		if($post_types) {
			foreach( $post_types as $type) {
				$searchable_types[] = $type->name;
			}
		}
		$query->set('post_type', $searchable_types);
	}
}
add_action('pre_get_posts', 'ecpt_include_post_types_in_search');