void insertInto(HitGroup group) {
            for (Hit hit: otherHits) {
                group.add(hit);
            }

            for (HitGroup hit: resultSets.values() ) {
                hit.copyOrdering(group);
                group.add(hit);
            }
        }
Groups hits according to document type.
For each group, the desired number of hits can be specified.

@author Tony Vaagenes
container-search/src/main/java/com/yahoo/prelude/searcher/MultipleResultsSearcher.java