private static boolean containsKMSKeyARN() {
        return !StringUtils.isNullOrEmpty(s3DestinationAWSKMSKeyId);
    }
Returns true if the KMS Key ARN is specified in properties file.

@return true, if KMS Key is specified
src/samples/AmazonKinesisFirehose/AbstractAmazonKinesisFirehoseDelivery.java