docs: function( s, prefix ){
  
      if( prefix ) s = prefix + '.' + s;
  
      // Add the __uc prefix (if necessary)
      if( this._isSearchableAsString( s ) ) {
        s = this._addUcPrefixToPath( s );
      }
      // Turn it into a proper field path (it will only affect fields with "." in them)
      s = this._addChildrenPrefixToPath( s );
  
      return s;
    }