void scanResult(Execution execution) {
            List<Hit> hits = group.asUnorderedHits();
            for (int i = hits.size()-1; i >= 0; i--) {
                Hit hit = hits.get(i);
                if (!hit.isMeta()) {
                    scan(hit, i, execution);
                } else {
                    result.hits().add(hit);
                }
            }
        }
Produce a single blended hit list from a group of hitgroups.

This assumes that all hits are organized into hitgroups. If not, blending will not be performed.
container-search/src/main/java/com/yahoo/prelude/searcher/BlendingSearcher.java