code: public Observable<ApplicationInner> createAsync(String resourceGroupName, String clusterName, String applicationName, ApplicationInner parameters) {
          return createWithServiceResponseAsync(resourceGroupName, clusterName, applicationName, parameters).map(new Func1<ServiceResponse<ApplicationInner>, ApplicationInner>() {
              @Override
              public ApplicationInner call(ServiceResponse<ApplicationInner> response) {
                  return response.body();
              }
          });
      }
docs: Creates applications for the HDInsight cluster.
  
  @param resourceGroupName The name of the resource group.
  @param clusterName The name of the cluster.
  @param applicationName The constant value for the application name.
  @param parameters The application create request.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable for the request