// Test init method with various configurations
    @Test
    public void test_init_withAllFields() {
        FessConfig fessConfig = new FessConfig.SimpleImpl() {
            @Override
            public String getQueryFacetFields() {
                return "field1, field2, field3";
            }

            @Override
            public String getQueryFacetFieldsSize() {
                return "10";
            }

     */
    @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: Fields for facet queries.
     * @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>
     * comment: Size of facet fields.