docs: private void printQueryStats(final HttpQuery query) {
      switch (query.apiVersion()) {
      case 0:
      case 1:
        query.sendReply(query.serializer().formatQueryStatsV1(
            QueryStats.getRunningAndCompleteStats()));
        break;
      default: 
        throw new BadRequestException(HttpResponseStatus.NOT_IMPLEMENTED, 
            "Requested API version not implemented", "Version " + 
            query.apiVersion() + " is not implemented");
      }
    }