@Override
    public java.util.concurrent.Future<CreateExportTaskResult> createExportTaskAsync(CreateExportTaskRequest request) {

        return createExportTaskAsync(request, null);
    }
Abstract implementation of {@code AWSLogsAsync}. 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-logs/src/main/java/com/amazonaws/services/logs/AbstractAWSLogsAsync.java