code: public Observable<CognitiveServicesAccountInner> getByResourceGroupAsync(String resourceGroupName, String accountName) {
          return getByResourceGroupWithServiceResponseAsync(resourceGroupName, accountName).map(new Func1<ServiceResponse<CognitiveServicesAccountInner>, CognitiveServicesAccountInner>() {
              @Override
              public CognitiveServicesAccountInner call(ServiceResponse<CognitiveServicesAccountInner> response) {
                  return response.body();
              }
          });
      }
docs: Returns a Cognitive Services account specified by the parameters.
  
  @param resourceGroupName The name of the resource group within the user's subscription.
  @param accountName The name of Cognitive Services account.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the CognitiveServicesAccountInner object