indexUpdateCallback.addFavoriteCountField(doc, "http://example.com", "favorite_count");

        assertEquals(99L, doc.get("favorite_count"));
    }

    @Test
    public void test_getDocumentSize() {
        assertEquals(0, indexUpdateCallback.getDocumentSize());

        DataStoreParams paramMap = new DataStoreParams();
        Map<String, Object> dataMap = new HashMap<>();