@Override
    public void fill(Result result, String summaryClass, Execution execution) {
        Result filledResult;
        filledResult = completelyFilledResults.get(getQueryKeyClone(result.getQuery()));

        if (filledResult == null) {
            filledResult = defaultFilledResult;
        }
        fillHits(filledResult, result, summaryClass);
    }
Returns a query clone which has sourcr, offset and hits set to null. This is used by access to
the maps using the query as key to achieve lookup independent of offset/hits value
container-search/src/main/java/com/yahoo/search/searchchain/testutil/DocumentSourceSearcher.java