final String[] tags = extractTags(tagFieldNames, tagFieldName -> {
            final List<String> results = new ArrayList<>(Arrays.asList(SuggestUtil.parseQuery(queryString, tagFieldName)));
            if (filterQueryString != null) {
                results.addAll(Arrays.asList(SuggestUtil.parseQuery(filterQueryString, tagFieldName)));
            }
            return results.toArray(new String[0]);
        });