docs: public Observable<ActivityInner> getAsync(String resourceGroupName, String automationAccountName, String moduleName, String activityName) {
          return getWithServiceResponseAsync(resourceGroupName, automationAccountName, moduleName, activityName).map(new Func1<ServiceResponse<ActivityInner>, ActivityInner>() {
              @Override
              public ActivityInner call(ServiceResponse<ActivityInner> response) {
                  return response.body();
              }
          });
      }