code: public static void setConversionProperties(Configuration conf) {
      if (conf != null) {
        useEnumId = conf.getBoolean(USE_ENUM_ID_CONF_KEY, false);
        LOG.debug("useEnumId is set to " + useEnumId);
      }
    }
docs: Set the flags that can be used by the conversion.
  @param conf usually the Hadoop job conf