code: public Observable<ServiceResponse<TextOperationResult>> getTextOperationResultWithServiceResponseAsync(String operationId) {
          if (this.client.endpoint() == null) {
              throw new IllegalArgumentException("Parameter this.client.endpoint() is required and cannot be null.");
          }
          if (operationId == null) {
              throw new IllegalArgumentException("Parameter operationId is required and cannot be null.");
          }
          String parameterizedHost = Joiner.on(", ").join("{Endpoint}", this.client.endpoint());
          return service.getTextOperationResult(operationId, this.client.acceptLanguage(), parameterizedHost, this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<TextOperationResult>>>() {
                  @Override
                  public Observable<ServiceResponse<TextOperationResult>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<TextOperationResult> clientResponse = getTextOperationResultDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: This interface is used for getting text operation result. The URL to this interface should be retrieved from 'Operation-Location' field returned from Recognize Text interface.
  
  @param operationId Id of the text operation returned in the response of the 'Recognize Text'
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the TextOperationResult object