mergedItem.setEmptySource(item2.toEmptyMap());

        // Sum frequencies
        mergedItem.setQueryFreq(item1.getQueryFreq() + item2.getQueryFreq());
        mergedItem.setDocFreq(item1.getDocFreq() + item2.getDocFreq());

        return mergedItem;
    }

    /**
     * Merges readings at a specific index from two reading arrays.
     */

        SuggestItem[] mergedItems = writer.mergeItems(new SuggestItem[] { item1, item2 });

        assertNotNull(mergedItems);
        assertEquals(1, mergedItems.length);
        assertEquals(3, mergedItems[0].getDocFreq());
    }

    @Test
    public void test_mergeItemsWithDifferentTexts() throws Exception {
        String[][] readings1 = new String[1][];
        readings1[0] = new String[] { "test1" };

    public long getQueryFreq() {
        return queryFreq;
    }

    /**
     * Returns the document frequency of the suggest item.
     * @return The document frequency.
     */
    public long getDocFreq() {
        return docFreq;
    }

    /**
     * Returns the user boost of the suggest item.
     * @return The user boost.
     */
    public float getUserBoost() {
        return userBoost;

        map.put(FieldNames.QUERY_FREQ, item.getQueryFreq());
        map.put(FieldNames.DOC_FREQ, item.getDocFreq());
        map.put(FieldNames.USER_BOOST, item.getUserBoost());
        map.put(FieldNames.SCORE, (item.getQueryFreq() + item.getDocFreq()) * item.getUserBoost());
        map.put(FieldNames.TIMESTAMP, item.getTimestamp().toInstant().toEpochMilli());
        return map;
    }

    /**

        assertEquals(1, item.getKinds().length);
        assertEquals(SuggestItem.Kind.QUERY, item.getKinds()[0]);
        assertEquals(50L, item.getQueryFreq());
        assertEquals(100L, item.getDocFreq());
        assertEquals(1.5f, item.getUserBoost(), 0.001f);
        assertNotNull(item.getTimestamp());
        assertNotNull(item.getId());
    }

    @Test
    public void testConstructorWithNullArrays() {

        String[][] readings = { { "test" } };

        SuggestItem item = new SuggestItem(text, readings, null, 0L, 0L, 1.0f, null, null, null, SuggestItem.Kind.QUERY);

        assertEquals(0L, item.getDocFreq());
        assertEquals(0L, item.getQueryFreq());
    }

    @Test
    public void test_maxFrequencies() {
        String[] text = { "test" };
        String[][] readings = { { "test" } };

        SuggestItem item = SuggestItemSerializer.fromSource(source);

        assertNotNull(item);
        assertEquals("test text", item.getText());
        assertEquals(10L, item.getDocFreq());
        assertEquals(5L, item.getQueryFreq());
        assertEquals(1.5f, item.getUserBoost(), 0.001f);
    }

    @Test
    public void testToJson() {
        String[] text = { "json test" };

        SuggestItem item2 = createItem("text", 20L, 15L, 2.0f);

        SuggestItem merged = SuggestItemMerger.merge(item1, item2);

        assertNotNull(merged);
        assertEquals(30L, merged.getDocFreq()); // 10 + 20
        assertEquals(20L, merged.getQueryFreq()); // 5 + 15
        assertEquals(2.0f, merged.getUserBoost(), 0.001f); // max(1.0, 2.0)
    }

    @Test
    public void testMerge_tags() {

        secondLine.put("fields", item.getFields());
        secondLine.put("queryFreq", item.getQueryFreq());
        secondLine.put("docFreq", item.getDocFreq());
        secondLine.put("userBoost", item.getUserBoost());
        secondLine.put("score", (item.getQueryFreq() + item.getDocFreq()) * item.getUserBoost());
        secondLine.put("tags", item.getTags());
        secondLine.put("roles", item.getRoles());

    .execute()
    .getResponse();

popularWords.getItems().forEach(item -> {
    System.out.println("Popular: " + item.getText() + 
                      " (freq: " + item.getDocFreq() + ")");
});
```

### Custom Text Processing

```java
import org.codelibs.fess.suggest.settings.SuggestSettings;
import org.codelibs.fess.suggest.converter.ReadingConverterChain;