doc.put("url", "   ");

        indexUpdater.addClickCountField(doc);

        assertNull(doc.get("click_count"));
    }

    // Test addFavoriteCountField with URL
    public void test_addFavoriteCountField_withUrl() {
        final Map<String, Object> doc = new HashMap<>();
        doc.put("url", "http://example.com");

        ((TestSearchLogHelper) searchLogHelper).setFavoriteCount(5L);