@Test
    public void test_evaluate_withBlankModelName() {
        // Test when model name is blank
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
            @Override
            public String getLtrModelName() {
                return "";
            }

            @Override
            public int getLtrWindowSize() {
                return 50;
            }
        });

    }

    @Override
    public RescorerBuilder<?> evaluate(final Map<String, Object> params) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String modelName = fessConfig.getLtrModelName();
        if (StringUtil.isBlank(modelName)) {
            return null;
        }
        return new QueryRescorerBuilder(new StoredLtrQueryBuilder().modelName(modelName).params(params))

    }

    default void setLtrModelName(final String value) {
        setSystemProperty(Constants.LTR_MODEL_NAME_PROPERTY, value);
    }

    default String getLtrModelName() {
        return getSystemProperty(Constants.LTR_MODEL_NAME_PROPERTY, StringUtil.EMPTY);
    }

    default void setLtrWindowSize(final int value) {