code: function getKinesisSequenceNumber(record) {
    return record && record.kinesis && record.kinesis.sequenceNumber ? record.kinesis.sequenceNumber : '';
  }
docs: Gets the sequence number from the given Kinesis stream event record.
  @param {KinesisEventRecord|*} record - a Kinesis stream event record
  @returns {string} the sequence number (if any) or an empty string