if (facetResponse != null && facetResponse.hasFacetResponse()) {
                // facet field
                if (facetResponse.getFieldList() != null) {
                    facetField = facetResponse.getFieldList().stream().map(field -> {
                        final Map<String, Object> fieldMap = new HashMap<>(2, 1f);
                        fieldMap.put("name", field.getName());

    /**
     * @return the queryCountMap
     */
    public Map<String, Long> getQueryCountMap() {
        return queryCountMap;
    }

    /**
     * @return the fieldList
     */
    public List<Field> getFieldList() {
        return fieldList;
    }

    @Override
    public String toString() {
        return "FacetResponse [queryCountMap=" + queryCountMap + ", fieldList=" + fieldList + "]";
    }

                // facet field
                buf.append(',');
                buf.append("\"facet_field\":[");
                if (facetResponse.getFieldList() != null) {
                    boolean first1 = true;
                    for (final Field field : facetResponse.getFieldList()) {
                        if (!first1) {
                            buf.append(',');
                        } else {