private static boolean onExclusiveSwitch(Node allocatedNode, NodeList clusterHosts) {
        return !NodeList.copyOf(List.of(allocatedNode)).onExclusiveSwitch(clusterHosts).isEmpty();
    }
Returns whether allocatedNode is on an exclusive switch
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/maintenance/SwitchRebalancer.java