while (chainIterator.hasNext()) {
        QueryBuilder fb = null;
        Criteria chainedCriteria = chainIterator.next();
        if (chainedCriteria.isOr()) {
            fb = QueryBuilders.boolQuery();
            for(QueryBuilder f: createFilterFragmentForCriteria(chainedCriteria)){
                ((BoolQueryBuilder)fb).should(f);
            }
            fbList.add(fb);
        } else if (chainedCriteria.isNegating()) {
            List<QueryBuilder> negationFilters = buildNegationFilter(criteria.getField().getName(), criteria.getFilterCriteriaEntries().iterator());

            if (!negationFilters.isEmpty()) {
                fbList.addAll(negationFilters);
            }
        } else {
            fbList.addAll(createFilterFragmentForCriteria(chainedCriteria));
        }
    }