code: public Observable<ServiceResponse<Page<NameIdentifierInner>>> listRecommendationsSinglePageAsync(final DomainRecommendationSearchParameters parameters) {
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (parameters == null) {
              throw new IllegalArgumentException("Parameter parameters is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          Validator.validate(parameters);
          return service.listRecommendations(this.client.subscriptionId(), parameters, this.client.apiVersion(), this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<Page<NameIdentifierInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<NameIdentifierInner>>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<PageImpl<NameIdentifierInner>> result = listRecommendationsDelegate(response);
                          return Observable.just(new ServiceResponse<Page<NameIdentifierInner>>(result.body(), result.response()));
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Get domain name recommendations based on keywords.
  Get domain name recommendations based on keywords.
  
  ServiceResponse<PageImpl<NameIdentifierInner>> * @param parameters Search parameters for domain name recommendations.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the PagedList&lt;NameIdentifierInner&gt; object wrapped in {@link ServiceResponse} if successful.