code: public Descriptor withTopics(TopicCall<?>... topicCalls) {
          return new Descriptor(name, calls, pathParamSerializers, messageSerializers, serializerFactory, exceptionSerializer, autoAcl, acls, headerFilter, locatableService, circuitBreaker,
                  this.topicCalls.plusAll(Arrays.asList(topicCalls)));
      }
docs: Add the given topic calls to this service.
  
  @param topicCalls The topic calls to add.
  @return A copy of this descriptor with the new calls added.