code: public Observable<DeploymentOperationInner> getAsync(String resourceGroupName, String deploymentName, String operationId) {
          return getWithServiceResponseAsync(resourceGroupName, deploymentName, operationId).map(new Func1<ServiceResponse<DeploymentOperationInner>, DeploymentOperationInner>() {
              @Override
              public DeploymentOperationInner call(ServiceResponse<DeploymentOperationInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets a deployments operation.
  
  @param resourceGroupName The name of the resource group. The name is case insensitive.
  @param deploymentName The name of the deployment.
  @param operationId The ID of the operation to get.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the DeploymentOperationInner object