@Override
        protected Configserver doBuild(DeployState deployState, TreeConfigProducer<AnyConfigProducer> parent, Element spec) {
            var configServer = new Configserver(parent, "configserver." + i, rpcPort);
            configServer.setProp("index", i);
            return configServer;
        }
Fallback when no config server is specified
config-model/src/main/java/com/yahoo/vespa/model/builder/xml/dom/DomAdminV2Builder.java