public int getClusterStateVersionBundleAcknowledged() {
        return (clusterStateVersionBundleAcknowledged == null ? -1 : clusterStateVersionBundleAcknowledged.getVersion());
    }
Sets the wanted state. The wanted state is taken as UP if a null argument is given
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/NodeInfo.java