// Merge arrays maintaining uniqueness
        mergedItem.setFields(mergeStringArrays(item1.getFields(), item2.getFields()));
        mergedItem.setTags(mergeStringArrays(item1.getTags(), item2.getTags()));
        mergedItem.setLanguages(mergeStringArrays(item1.getLanguages(), item2.getLanguages()));
        mergedItem.setRoles(mergeStringArrays(item1.getRoles(), item2.getRoles()));

        // Merge kinds

     */
    public String getMessageCode() {
        return messageCode;
    }

    /**
     * Returns the array of arguments.
     *
     * @return Array of arguments
     */
    public Object[] getArgs() {
        return args;
    }

    /**
     * Returns the SQL.
     *
     * @return SQL
     */
    public String getSql() {
        return sql;
    }

                    buf.append(",\"labels\":[");
                    for (int i = 0; i < item.getTags().length; i++) {
                        if (i > 0) {
                            buf.append(',');
                        }
                        buf.append('\"').append(StringEscapeUtils.escapeJson(item.getTags()[i])).append('\"');
                    }
                    buf.append(']');

                createDefaultReadingConverter(), createDefaultNormalizer());
        SuggestItem item = items.get(0);
        assertEquals("検索エンジン", item.getText());
        assertEquals("tag1", item.getTags()[0]);
        assertEquals("role1", item.getRoles()[0]);
    }

    protected ReadingConverter createDefaultReadingConverter() throws IOException {
        ReadingConverterChain chain = new ReadingConverterChain();

        // Overlapping values should not be duplicated
        assertTrue("Should have tag1", Arrays.asList(merged.getTags()).contains("tag1"));
        assertTrue("Should have tag3", Arrays.asList(merged.getTags()).contains("tag3"));
        // Check for no duplicates
        long tag2Count = Arrays.stream(merged.getTags()).filter(t -> t.equals("tag2")).count();
        assertEquals("tag2 should appear only once", 1, tag2Count);
    }

        final ElevateWord normalized = new ElevateWord(normalizedWord, elevateWord.getBoost(), normalizedReadings, elevateWord.getFields(),
                elevateWord.getTags(), elevateWord.getRoles());
        settings.elevateWord().add(normalized);
        if (apply) {
            final SuggestItem item = normalized.toSuggestItem();

        source.put(ELEVATE_WORD_READING, elevateWord.getReadings());
        source.put(ELEVATE_WORD_FIELDS, elevateWord.getFields());
        source.put(ELEVATE_WORD_TAGS, elevateWord.getTags());
        source.put(ELEVATE_WORD_ROLES, elevateWord.getRoles());
        source.put(FieldNames.TIMESTAMP, DateTimeFormatter.ISO_INSTANT.format(ZonedDateTime.now()));

        }

        @Override
        public void logout() throws ServletException {
        }

        @Override
        public Collection<Part> getParts() throws IOException, ServletException {
            return null;
        }

        @Override
        public Part getPart(String name) throws IOException, ServletException {
            return null;
        }

        SuggestItem item2 = createItemWithTags("text", "tag2", "tag3");

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

        String[] tags = merged.getTags();
        Set<String> tagSet = new HashSet<>(Arrays.asList(tags));

        assertEquals(3, tagSet.size());
        assertTrue(tagSet.contains("tag1"));
        assertTrue(tagSet.contains("tag2"));

        }

        @Override
        public void logout() {
        }

        @Override
        public java.util.Collection<jakarta.servlet.http.Part> getParts() {
            return null;
        }

        @Override
        public jakarta.servlet.http.Part getPart(String name) {
            return null;
        }

        @Override