@PostConstruct
    public void init() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        if (StringUtil.isNotBlank(fessConfig.getQueryFacetFields())) {
            field = StreamUtil.split(fessConfig.getQueryFacetFields(), ",")
                    .get(stream -> stream.map(String::trim).filter(StringUtil::isNotEmpty).distinct().toArray(n -> new String[n]));
        }

     * The value is, e.g. label <br>
     * comment: facet
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getQueryFacetFields();

    /**
     * Get the value for the key 'query.facet.fields.size'. <br>
     * The value is, e.g. 100 <br>