in src/main/java/com/amazonaws/neptune/auth/NeptuneRequestMetadataSigV4Signer.java [60:63]
public NeptuneRequestMetadataSigV4Signer(final String regionName,
final AWSCredentialsProvider v1AwsCredentialProvider) throws NeptuneSigV4SignerException {
super(regionName, v1AwsCredentialProvider);
}