code: @Override
      public CreateActivationResult createActivation(CreateActivationRequest request) {
          request = beforeClientExecution(request);
          return executeCreateActivation(request);
      }
docs: <p>
  Registers your on-premises server or virtual machine with Amazon EC2 so that you can manage these resources using
  Run Command. An on-premises server or virtual machine that has been registered with EC2 is called a managed
  instance. For more information about activations, see <a
  href="http://docs.aws.amazon.com/systems-manager/latest/userguide/systems-manager-managedinstances.html">Setting
  Up Systems Manager in Hybrid Environments</a>.
  </p>
  
  @param createActivationRequest
  @return Result of the CreateActivation operation returned by the service.
  @throws InternalServerErrorException
  An error occurred on the server side.
  @sample AWSSimpleSystemsManagement.CreateActivation
  @see <a href="http://docs.aws.amazon.com/goto/WebAPI/ssm-2014-11-06/CreateActivation" target="_top">AWS API
  Documentation</a>