code: func (kinesis *Kinesis) MergeShards(args *RequestArgs) error {
  	params := makeParams("MergeShards")
  	err := kinesis.query(params, args.params, nil)
  	if err != nil {
  		return err
  	}
  	return nil
  }
docs: // MergeShards merges two adjacent shards in a stream and combines them into a single shard to reduce the stream's capacity to ingest and transport data
  // more info http://docs.aws.amazon.com/kinesis/latest/APIReference/API_MergeShards.html