code: @Override
      public java.util.concurrent.Future<MergeShardsResult> mergeShardsAsync(String streamName, String shardToMerge, String adjacentShardToMerge,
              com.amazonaws.handlers.AsyncHandler<MergeShardsRequest, MergeShardsResult> asyncHandler) {
  
          return mergeShardsAsync(
                  new MergeShardsRequest().withStreamName(streamName).withShardToMerge(shardToMerge).withAdjacentShardToMerge(adjacentShardToMerge), asyncHandler);
      }
docs: Simplified method form for invoking the MergeShards operation with an AsyncHandler.
  
  @see #mergeShardsAsync(MergeShardsRequest, com.amazonaws.handlers.AsyncHandler)