in src/main/java/com/amazonaws/neptune/auth/NeptuneRequestMetadataSigV4Signer.java [73:77]
public NeptuneRequestMetadataSigV4Signer(final String regionName,
final AWSCredentialsProvider v1AwsCredentialProvider,
final String serviceName) throws NeptuneSigV4SignerException {
super(regionName, v1AwsCredentialProvider, serviceName);
}