data.putValue("key", "value1");
        assertEquals("value1", data.getValues("key")[0]);

        // Second operation (overwrite)
        data.putValue("key", "value2");
        assertEquals("value2", data.getValues("key")[0]);
        assertEquals(1, data.getValues("key").length);

        // Third operation with array (overwrite)
        data.putValues("key", new String[] { "value3", "value4", "value5" });

        data.addMetaData("key1", "value1");
        data.addMetaData("key2", 123);
        data.addMetaData("key3", true);

        Map<String, Object> metaDataMap = data.getMetaDataMap();
        assertNotNull(metaDataMap);
        assertEquals(3, metaDataMap.size());

        assertEquals("value1", metaDataMap.get("key1"));
        assertEquals(123, metaDataMap.get("key2"));

    /** Storage endpoint configuration key. */
    public static final String STORAGE_ENDPOINT = "storage.endpoint";

    /** Storage access key configuration key. */
    public static final String STORAGE_ACCESS_KEY = "storage.accesskey";

    /** Storage secret key configuration key. */
    public static final String STORAGE_SECRET_KEY = "storage.secretkey";

    }

    /**
     * Retrieves an extractor for the specified key.
     * If multiple extractors are associated with the key, returns a composite extractor
     * that tries each extractor in order until one succeeds.
     *
     * @param key the key to look up
     * @return the extractor for the key, or null if not found
     */
    public Extractor getExtractor(final String key) {

        if (StringUtil.isNotBlank(key)) {
            textBuilder.append(key).append(fieldSeparator).append(value).append(lineSeparator);
        } else {
            textBuilder.append(value).append(lineSeparator);
        }

        // Add to metadata if at top level
        if (depth <= 1 && StringUtil.isNotBlank(key)) {
            metadataMap.computeIfAbsent(key, k -> new ArrayList<>()).add(value);
        }

    }

    /**
     * Gets the map of display keys to query strings.
     *
     * @return the query map
     */
    public Map<String, String> getQueryMap() {
        return queryMap;
    }

    /**
     * Adds a query to the query map with the specified display key.
     *
     * @param key the display key for the query
     * @param query the query string to add
     */

    }

    /**
     * Returns the key.
     *
     * @return the key
     */
    public String getKey() {
        return key;
    }

    /**
     * Sets the key.
     *
     * @param key
     *            the key
     */
    public void setKey(final String key) {
        this.key = key;
    }

    /**
     * Returns the charset name.
     *

      with:
        java-version: '21'
        distribution: 'temurin'
    - uses: actions/cache@v4
      with:
        path: ~/.m2/repository
        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
        restore-keys: |
          ${{ runner.os }}-maven-
    - name: Checkout fess-parent
      uses: actions/checkout@v4
      with:
        repository: codelibs/fess-parent

     * If data appending is enabled and the key already exists, values are combined into arrays.
     *
     * @param dataMap the data map to modify
     * @param key the key to store the value under
     * @param value the value to store
     */
    default void putResultDataBody(final Map<String, Object> dataMap, final String key, final Object value) {

        return map.get(key);
    }

    /**
     * Retrieves a setting value as a String.
     * @param key The key of the setting.
     * @param defaultValue The default value if the setting is not found.
     * @return The setting value as a String.
     */
    public String getAsString(final String key, final String defaultValue) {
        final Object obj = get(key);

        final String value;