private BlendingSearcherWrapper setupFirstAndSecond() {
        DocumentSourceSearcher first = new DocumentSourceSearcher();
        DocumentSourceSearcher second = new DocumentSourceSearcher();

        Query query = new Query("?query=banana");

        Result r1 = new Result(query);
        r1.setTotalHitCount(1);
        Hit r1h1 = new Hit("http://first/relevancy100", 200);
        r1.hits().add(r1h1);
        first.addResult(query, r1);

        Result r2 = new Result(query);
        r2.setTotalHitCount(2);
        Hit r2h1 = new Hit("http://second/relevancy300", 300);
        Hit r2h2 = new Hit("http://second/relevancy100", 100);
        r2.hits().add(r2h1);
        r2.hits().add(r2h2);
        second.addResult(query, r2);

        BlendingSearcherWrapper blender = new BlendingSearcherWrapper();
        blender.addSource(new Chain<>("first", new FillSearcher(), first));
        blender.addSource(new Chain<>("second", new FillSearcher(), second));
        blender.initialize();
        return blender;
    }
Disabled because the document source searcher does not handle being asked for
document sumaries for hits it did not create (it will insert the wrong values).
But are we sure fsearch handles this case correctly?
container-search/src/test/java/com/yahoo/prelude/searcher/test/BlendingSearcherTestCase.java