Restricting the indexing to particular user roles ?

Hello, I found this code on the official website of Relevanssi, but it’s doesn’t seem to work anymore.

add_filter( 'relevanssi_user_index_ok', 'rlv_do_not_index_admins', 10, 2 );
function rlv_do_not_index_admins( $do_index, $user ) {
  $block_these_roles = array(
    'administrator',
    'editor',
    'author',
    'contributor',
    'subscriber'
  );
	
  $vars = get_object_vars( $user );
  if ( is_array( $vars['caps'] ) ) {
    foreach ( array_keys( $vars['caps'] ) as $role ) {
      if ( in_array( $role, $block_these_roles, true ) ) {
        $do_index = false;
        break;
      }
    }
  }
  
  return $do_index;
}