code: @Override
      public java.util.concurrent.Future<BatchWriteItemResult> batchWriteItemAsync(java.util.Map<String, java.util.List<WriteRequest>> requestItems) {
  
          return batchWriteItemAsync(new BatchWriteItemRequest().withRequestItems(requestItems));
      }
docs: Simplified method form for invoking the BatchWriteItem operation.
  
  @see #batchWriteItemAsync(BatchWriteItemRequest)