docs: public Observable<StorageAccountInner> getByResourceGroupAsync(String resourceGroupName, String accountName) {
          return getByResourceGroupWithServiceResponseAsync(resourceGroupName, accountName).map(new Func1<ServiceResponse<StorageAccountInner>, StorageAccountInner>() {
              @Override
              public StorageAccountInner call(ServiceResponse<StorageAccountInner> response) {
                  return response.body();
              }
          });
      }