QueryContext context = new QueryContext(null, false);
        MatchAllDocsQuery query = new MatchAllDocsQuery();

        QueryBuilder queryBuilder = queryProcessor.execute(context, query, 1.0f);
        assertTrue(called.get());
        assertEquals(BoolQueryBuilder.class, queryBuilder.getClass());

        called.set(false);
        final AtomicBoolean calledFirst = new AtomicBoolean(false);

        }

        // set query.
        final QueryBuilder q = buildQuery(query, fields);

        // set function score
        final QueryBuilder queryBuilder = buildFunctionScoreQuery(query, q);
        builder.addSort("_score", SortOrder.DESC);

        // set filter query.
        final List<QueryBuilder> filterList = new ArrayList<>(10);
        if (!tags.isEmpty()) {

        // clean up
        final QueryBuilder queryBuilder = QueryBuilders.rangeQuery(fessConfig.getIndexFieldExpires()).to("now");
        try {
            searchEngineClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(), queryBuilder);

        } catch (final Exception e) {
            logger.error("Could not delete expired documents: {}", queryBuilder, e);
            resultBuf.append(e.getMessage()).append("\n");

    //                                                                               =====
    public void addQuery(QueryBuilder queryBuilder) {
        assertObjectNotNull("queryBuilder", queryBuilder);
        regQ(queryBuilder);
    }

    public void queryString(String queryString) {
        checkEsInvalidQuery("queryString", queryString);
        doQueryString(queryString, null);
    }

    //                                                                               =====
    public void addQuery(QueryBuilder queryBuilder) {
        assertObjectNotNull("queryBuilder", queryBuilder);
        regQ(queryBuilder);
    }

    public void queryString(String queryString) {
        checkEsInvalidQuery("queryString", queryString);
        doQueryString(queryString, null);
    }

    }

    protected QueryBuilder convertPrefixQuery(final FessConfig fessConfig, final QueryContext context, final TermQuery termQuery,
            final float boost, final String field, final String text) {
        return getQueryProcessor().execute(context, new PrefixQuery(new Term(field, text.substring(0, text.length() - 1))), boost);
    }

    @Override
    public SearchRequestBuilder build(SearchRequestBuilder builder) {
        if (_conditionQuery != null) {
            QueryBuilder queryBuilder = _conditionQuery.getQuery();
            if (queryBuilder != null) {
                builder.setQuery(queryBuilder);
            }
            _conditionQuery.getFieldSortBuilderList().forEach(sort -> {
                builder.addSort(sort);
            });
        }

    @Override
    public SearchRequestBuilder build(SearchRequestBuilder builder) {
        if (_conditionQuery != null) {
            QueryBuilder queryBuilder = _conditionQuery.getQuery();
            if (queryBuilder != null) {
                builder.setQuery(queryBuilder);
            }
            _conditionQuery.getFieldSortBuilderList().forEach(sort -> {
                builder.addSort(sort);
            });
        }

    }

    protected QueryBuilder convertBooleanQuery(final QueryContext context, final BooleanQuery booleanQuery, final float boost) {
        final BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        for (final BooleanClause clause : booleanQuery.clauses()) {
            final QueryBuilder queryBuilder = getQueryProcessor().execute(context, clause.getQuery(), boost);

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return deleteDocumentByQuery(searchEngineClient, fessConfig.getIndexDocumentUpdateIndex(), queryBuilder);
    }

    protected long deleteDocumentByQuery(final SearchEngineClient searchEngineClient, final String index, final QueryBuilder queryBuilder) {