code: public Observable<HybridConnectionInner> getHybridConnectionAsync(String resourceGroupName, String name, String namespaceName, String relayName) {
          return getHybridConnectionWithServiceResponseAsync(resourceGroupName, name, namespaceName, relayName).map(new Func1<ServiceResponse<HybridConnectionInner>, HybridConnectionInner>() {
              @Override
              public HybridConnectionInner call(ServiceResponse<HybridConnectionInner> response) {
                  return response.body();
              }
          });
      }
docs: Retrieve a Hybrid Connection in use in an App Service plan.
  Retrieve a Hybrid Connection in use in an App Service plan.
  
  @param resourceGroupName Name of the resource group to which the resource belongs.
  @param name Name of the App Service plan.
  @param namespaceName Name of the Service Bus namespace.
  @param relayName Name of the Service Bus relay.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the HybridConnectionInner object