try (OutputStream out = file.openOutputStream(false)) {
            out.write(initial.getBytes("UTF-8"));
        }

        // Append additional content
        String append = "Appended content\n";
        try (OutputStream out = file.openOutputStream(true)) { // true = append mode
            out.write(append.getBytes("UTF-8"));
        }

        // Verify combined content

     * Adds search highlighting for HTML and PDF documents.
     *
     * @param document the document data map
     * @param url the base URL
     * @return the URL with appended query parameters
     */
    protected String appendQueryParameter(final Map<String, Object> document, final String url) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();