String getShardId() {
    return shardId;
  }
Invoked by the Amazon Kinesis Client Library to indicate it will no longer send data records to this
RecordProcessor instance.

@param shutdownInput Provides information and capabilities (eg checkpointing) related to shutdown of this record
       processor.
samza-aws/src/main/java/org/apache/samza/system/kinesis/consumer/KinesisRecordProcessor.java