code: public Iterable<DContact> queryBySecondaryCustomIndex(Object parent, java.lang.String secondaryCustomIndex) {
      return queryByField(parent, DContactMapper.Field.SECONDARYCUSTOMINDEX.getFieldName(), secondaryCustomIndex);
    }
docs: query-by method for field secondaryCustomIndex
  @param secondaryCustomIndex the specified attribute
  @return an Iterable of DContacts for the specified secondaryCustomIndex