public String getNextContinuationToken() {
        return nextContinuationToken;
    }
Gets the optional NextContinuationToken.
NextContinuationToken is sent when isTruncated is true meaning there are
more keys in the bucket that can be listed. The next list requests to Amazon
S3 can be continued by providing this NextContinuationToken.

@return The optional NextContinuationToken parameter.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/model/ListBucketMetricsConfigurationsResult.java