private ApplicationFile writeFile(byte[] data) {
        Path zkPath = getZKPath(path);
        String status = ContentStatusNew;
        if (zkApp.exists(zkPath)) {
            status = ContentStatusChanged;
        }
        zkApp.putData(zkPath, data);
        writeMetaFile(data, status);
        return this;
    }
@author Ulf Lilleengen
@author Vegard Havdal
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplicationFile.java