code: public BulkMutation createBulkMutation(BigtableTableName tableName) {
      if (options.useGCJClient()) {
        LOG.warn("Using cloud-bigtable-client's implementation of BulkMutation.");
      }
      return new BulkMutation(
          tableName,
          throttlingDataClient,
          BigtableSessionSharedThreadPools.getInstance().getRetryExecutor(),
          options.getBulkOptions());
    }
docs: <p>createBulkMutation.</p>
  
  @param tableName a {@link com.google.cloud.bigtable.grpc.BigtableTableName} object.
  @return a {@link com.google.cloud.bigtable.grpc.async.BulkMutation} object.