function to order search results by title

WP search by title relevance

//Ordena busca pelo titulo
add_action( 'pre_get_posts', 'my_change_sort_order');
function my_change_sort_order($query){
    if(is_search()):
        //If you wanted it for the archive of a custom post type use: is_post_type_archive( $post_type )
        //Set the order ASC or DESC
        $query->set( 'order', 'ASC' );
        //Set the orderby
        $query->set( 'orderby', 'relevance' );
    endif;
};