private MetaData getMetaDataFromZk(Path metaPath) {
        try {
            return mapper.readValue(zkApp.getBytes(metaPath), MetaData.class);
        } catch (IOException e) {
            return null;
        }
    }
@author Ulf Lilleengen
@author Vegard Havdal
configserver/src/main/java/com/yahoo/vespa/config/server/zookeeper/ZKApplicationFile.java