surfdog9

Thanks for your help. This modification was a request from our SEO team. I was able to modify with the following:

add_filter( 'wpseo_robots', 'yoast_seo_robots_modify_search' );

function yoast_seo_robots_modify_search( $robots ) {
  if ( is_search() ) {
    return "noindex, nofollow";
  } else {
    return $robots;
  }
}