How to add shortcode to the results content?

Displaying shortcode outputs on the live search results content field

What is this, and where do I put this custom code?

add_filter( 'asp_results', 'asp_my_custom_shortcodes_in_results', 10, 4 );
function asp_custom_link_results( $results, $search_id, $is_ajax, $args ) {
    foreach ($results as $k=>&$r) {
		if ( isset($r->post_type) ) {
			$r->content .= do_shortcode("[my_custom_shortcode]");
		}
    }
    return $results;
}

It is also possible to pass the post ID to the shortcode as a parameter if neccessary:

add_filter( 'asp_results', 'asp_my_custom_shortcodes_in_results', 10, 4 );
function asp_custom_link_results( $results, $search_id, $is_ajax, $args ) {
    foreach ($results as $k=>&$r) {
		if ( isset($r->post_type) ) {
			$r->content .= do_shortcode("[my_custom_shortcode id={$r->id}]");
		}
    }
    return $results;
}