code: public Observable<Suggestions> autoSuggestAsync(String query, AutoSuggestOptionalParameter autoSuggestOptionalParameter) {
          return autoSuggestWithServiceResponseAsync(query, autoSuggestOptionalParameter).map(new Func1<ServiceResponse<Suggestions>, Suggestions>() {
              @Override
              public Suggestions call(ServiceResponse<Suggestions> response) {
                  return response.body();
              }
          });
      }
docs: The AutoSuggest API lets you send a search query to Bing and get back a list of suggestions. This section provides technical details about the query parameters and headers that you use to request suggestions and the JSON response objects that contain them.
  
  @param query The user's search term.
  @param autoSuggestOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the Suggestions object