How to display only post in search results?

Hello

I use Wordpress download manager and it create a page for each file, I don't use these pages, I attach the files to posts that's Why i don't want to display in search.

In function.php i use this code.

function fb_search_filter( $query ) {
    if ( ! $query->is_admin && $query->is_search ) {
        $query->set( 'post_type', array( 'downloads', 'post' ) );
    }

    return $query;
}
add_filter( 'pre_get_posts', 'fb_search_filter' );

Is this correct? or is better in another way?

Thanks