private Path getFullPath(Path path) {
        Path fullPath = appPath;
        if (path != null) {
            fullPath = appPath.append(path);
        }
        return fullPath;
    }
Checks if the given node exists under path under this active app

@param path a zookeeper path
@return true if the node exists in the path, false otherwise
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplication.java