@Override
    public java.util.concurrent.Future<CreateEnvironmentEC2Result> createEnvironmentEC2Async(CreateEnvironmentEC2Request request) {

        return createEnvironmentEC2Async(request, null);
    }
Returns the executor service used by this client to execute async requests.

@return The executor service used by this client to execute async requests.
aws-java-sdk-cloud9/src/main/java/com/amazonaws/services/cloud9/AWSCloud9AsyncClient.java