private void setRelevanceMetric(int pos, String name, Queue<Double> minQueue, Metric.Context context) {
        while (minQueue.size() > pos) {
            minQueue.remove();
        }
        if (minQueue.size() == pos) {
            metric.set(name, minQueue.poll(), context);
        }
    }
Effectively flattens the hits, and measures relevance @ 1, 3, and 10
container-search/src/main/java/com/yahoo/prelude/statistics/StatisticsSearcher.java