code: public Observable<ServiceResponse<OrchestratorVersionProfileListResultInner>> listOrchestratorsWithServiceResponseAsync(String location) {
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          if (location == null) {
              throw new IllegalArgumentException("Parameter location is required and cannot be null.");
          }
          if (this.client.apiVersion() == null) {
              throw new IllegalArgumentException("Parameter this.client.apiVersion() is required and cannot be null.");
          }
          final String resourceType = null;
          return service.listOrchestrators(this.client.subscriptionId(), location, this.client.apiVersion(), resourceType, this.client.acceptLanguage(), this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<OrchestratorVersionProfileListResultInner>>>() {
                  @Override
                  public Observable<ServiceResponse<OrchestratorVersionProfileListResultInner>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<OrchestratorVersionProfileListResultInner> clientResponse = listOrchestratorsDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }
docs: Gets a list of supported orchestrators in the specified subscription.
  Gets a list of supported orchestrators in the specified subscription. The operation returns properties of each orchestrator including verison and available upgrades.
  
  @param location The name of a supported Azure region.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the OrchestratorVersionProfileListResultInner object