code: public Observable<Page<OperationMetadataInner>> listAsync() {
          return listWithServiceResponseAsync()
              .map(new Func1<ServiceResponse<Page<OperationMetadataInner>>, Page<OperationMetadataInner>>() {
                  @Override
                  public Page<OperationMetadataInner> call(ServiceResponse<Page<OperationMetadataInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Result of the request to list REST API operations.
  
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;OperationMetadataInner&gt; object