* @return The merged suggest item.
     */
    public static SuggestItem merge(final SuggestItem item1, final SuggestItem item2) {
        if (!item1.getId().equals(item2.getId())) {
            throw new IllegalArgumentException("Item id is mismatch.");
        }

        final SuggestItem mergedItem = new SuggestItem();

        mergedItem.id = item1.getId();
        mergedItem.text = item1.getText();

        SuggestItem suggestItem = elevateWord.toSuggestItem();

        assertNotNull(suggestItem);
        assertEquals(word, suggestItem.getText());
        assertEquals(boost, suggestItem.getUserBoost(), 0.001f);
        // The queryFreq and docFreq might be handled differently by SuggestItem
        assertTrue(suggestItem.getQueryFreq() >= 0);

                items.add(new SuggestItem(words, readings, new String[] { field }, 0, 1, -1, tags, roles, null, SuggestItem.Kind.QUERY));
            }
        } catch (final IOException e) {
            throw new SuggesterException("Failed to create SuggestItem from query log.", e);
        }

        return items;
    }

    @Override

    }

    @Test
    public void testConcatKinds() {
        // Test static concatKinds method
        SuggestItem.Kind[] kinds1 = { SuggestItem.Kind.QUERY };
        SuggestItem.Kind[] kinds2 = { SuggestItem.Kind.DOCUMENT, SuggestItem.Kind.QUERY };

        SuggestItem.Kind[] result = SuggestItem.concatKinds(kinds1, kinds2);

        assertNotNull(result);

            items.add(new SuggestItem(new String[] { "マルチワード" + i, "fuga" }, readings, new String[] { "content" }, 0, 15 + i, -1, tags,
                    roles, null, SuggestItem.Kind.QUERY));
        }

        return items.toArray(new SuggestItem[items.size()]);
    }

    private SuggestItem[] getItemSet2() {
        List<SuggestItem> items = new ArrayList<>();

        {

    public SuggestIndexResponse index(final SuggestItem item) {
        return index(new SuggestItem[] { item });
    }

    /**
     * Indexes multiple suggest items.
     * @param items The suggest items to index.
     * @return The SuggestIndexResponse.
     */
    public SuggestIndexResponse index(final SuggestItem[] items) {
        // TODO parallel?

    @Test
    public void testCreateBulkLineWithMinimalItem() {
        // Test with minimal SuggestItem
        SuggestItem item = new SuggestItem(new String[] { "minimal" }, new String[0][0], new String[0], 0, // queryFreq
                0, // docFreq
                1.0f, // userBoost
                new String[0], new String[0], new String[0], SuggestItem.Kind.DOCUMENT);
        item.setTimestamp(ZonedDateTime.now());

```java
import org.codelibs.fess.suggest.entity.SuggestItem;

// Create suggestion item with text, readings, and metadata
String[][] readings = new String[2][];
readings[0] = new String[]{"kensaku", "engine"};
readings[1] = new String[]{"search", "injin"};

String[] tags = new String[]{"technology", "search"};
String[] roles = new String[]{"admin", "user"};

SuggestItem item = new SuggestItem(

        boolQueryBuilder.must(QueryBuilders.termQuery(FieldNames.KINDS, SuggestItem.Kind.DOCUMENT.toString()));
        boolQueryBuilder.mustNot(QueryBuilders.termQuery(FieldNames.KINDS, SuggestItem.Kind.QUERY.toString()));
        boolQueryBuilder.mustNot(QueryBuilders.termQuery(FieldNames.KINDS, SuggestItem.Kind.USER.toString()));

     * @param item the SuggestItem containing the data to be indexed
     * @return a string representing the bulk line for OpenSearch indexing
     * @throws SuggesterException if an I/O error occurs during the creation of the bulk line
     */
    public static String createBulkLine(final String index, final String type, final SuggestItem item) {