code: protected static HelixManager buildHelixManager(Config config, String zkConnectionString, String clusterName, InstanceType type) {
      String helixInstanceName = ConfigUtils.getString(config, GobblinClusterConfigurationKeys.HELIX_INSTANCE_NAME_KEY,
          GobblinClusterManager.class.getSimpleName());
      return HelixManagerFactory.getZKHelixManager(
          config.getString(clusterName), helixInstanceName, type, zkConnectionString);
    }
docs: Build the {@link HelixManager} for the Application Master.