public String getRequestId() {
        return metadata.get(AWS_REQUEST_ID);
    }
Returns the AWS request ID contained in this response metadata object.
AWS request IDs can be used in the event a service call isn't working as
expected and you need to work with AWS support to debug an issue.

@return The AWS request ID contained in this response metadata object.
aws-java-sdk-core/src/main/java/com/amazonaws/ResponseMetadata.java