private void write(Version vespaVersion, FileRegistry fileRegistry) {
            String exportedRegistry = FileDBRegistry.exportRegistry(fileRegistry);
            curator.set(getZooKeeperAppPath(ZKApplicationPackage.fileRegistryNode).append(vespaVersion.toFullString()),
                        Utf8.toBytes(exportedRegistry));
        }
Feeds all user-defined .def file from the application package into ZooKeeper (both into
/defconfigs and /userdefconfigs
configserver/src/main/java/com/yahoo/vespa/config/server/deploy/ZooKeeperDeployer.java