code: public Observable<FeatureResultInner> getAsync(String resourceProviderNamespace, String featureName) {
          return getWithServiceResponseAsync(resourceProviderNamespace, featureName).map(new Func1<ServiceResponse<FeatureResultInner>, FeatureResultInner>() {
              @Override
              public FeatureResultInner call(ServiceResponse<FeatureResultInner> response) {
                  return response.body();
              }
          });
      }
docs: Gets the preview feature with the specified name.
  
  @param resourceProviderNamespace The resource provider namespace for the feature.
  @param featureName The name of the feature to get.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the FeatureResultInner object