Wordpress - Disable Search Function

[admin]

I've added the following code to functions.php to disable archived/crawled/url searching on my wordpress site for performance reasons:

function disable_search( $query, $error = true ) {
  if ( is_search() ) {
$query->is_search = false;
$query->query_vars[s] = false;
$query->query[s] = false;
// to error
if ( $error == true )
$query->is_404 = true;
  }
}

add_action( 'parse_query', 'disable_search' );
add_filter( 'get_search_form', create_function( '$a', "return null;" ) );

This works perfectly to prevent searching, but also prevents searching for posts in the admin area.

Is there a way to disable searches for users but still allow the admins to search?

Currently, my workaround is to remove this code, perform my necessary search, then paste it back.