public CommonStatsFlags all(){
  flags=EnumSet.allOf(Flag.class);
  types=null;
  groups=null;
  fieldDataFields=null;
  completionDataFields=null;
  return this;
}

public CommonStatsFlags all ( ) { flags = EnumSet . allOf ( Flag . class ) ; types = null ; groups = null ; fieldDataFields = null ; completionDataFields = null ; return this ; }
sets all flags to return all stats .
