private boolean aGroupContainsNode(Collection<Integer> groupIndexes, Node node) {
        for (Group group : getGroupsWithIndexes(groupIndexes)) {
            if (groupContainsNode(group, node))
                return true;
        }

        return false;
    }
Returns a disallow-result, if there is a node in the group with wanted state != UP.
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/NodeStateChangeChecker.java