public Hit get(int index) {
        updateHits();
        ensureSorted();
        return hits.get(index);
    }
Returns the hit at the given (0-base) index in this group of hit
(without searching any subgroups).

@param  index the index into this list
@throws IndexOutOfBoundsException if there is no hit at the given index
container-search/src/main/java/com/yahoo/search/result/HitGroup.java