@Override
    public java.util.concurrent.Future<PutSnapshotBlockResult> putSnapshotBlockAsync(PutSnapshotBlockRequest request) {

        return putSnapshotBlockAsync(request, null);
    }
Abstract implementation of {@code AmazonEBSAsync}. Convenient method forms pass through to the corresponding overload
that takes a request object and an {@code AsyncHandler}, which throws an {@code UnsupportedOperationException}.
aws-java-sdk-ebs/src/main/java/com/amazonaws/services/ebs/AbstractAmazonEBSAsync.java