docs: public ModelService getModelService(String serviceName) {
          ModelService service = null;
          try{
              service = getDirectoryServiceClient().lookupService(serviceName);
          }catch(ServiceException se){
              if (se.getErrorCode()==ErrorCode.SERVICE_DOES_NOT_EXIST){
                  LOGGER.error(se.getMessage());
              }else {
                  LOGGER.error("Error when getModelService", se);
              }
              throw se;
          }
          return service;
      }