* @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getSearchEngineUsername();

    /**
     * Get the value for the key 'search_engine.username' as {@link Integer}. <br>
     * The value is, e.g.  <br>
     * comment: Username for authenticating to the search engine.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)

        try {
            final Blob blob = storage.get(BlobId.of(bucket, objectName));
            if (blob == null) {
                throw new StorageException("Object not found: " + objectName);
            }
            blob.downloadTo(outputStream);
        } catch (final StorageException e) {
            throw e;
        } catch (final Exception e) {

     * @param fields Array of field names to include in the result
     * @param userBean Optional user information for permission checking
     * @return Optional entity containing the document data if found
     */
    public OptionalEntity<Map<String, Object>> getDocumentByDocId(final String docId, final String[] fields,
            final OptionalThing<FessUserBean> userBean) {

    }

    /**
     * Retrieves a character mapping item by its ID.
     *
     * @param id the unique identifier of the mapping item to retrieve
     * @return an OptionalEntity containing the mapping item if found, empty otherwise
     */
    @Override
    public OptionalEntity<CharMappingItem> get(final long id) {
        if (mappingItemList == null) {
            reload(null);
        }

    /**
     * Removes and returns state data from the HTTP session.
     * @param session The HTTP session.
     * @param state The state parameter to remove.
     * @return The removed state data or null if not found.
     */
    protected StateData removeStateFromSession(final HttpSession session, final String state) {
        @SuppressWarnings("unchecked")

labels.contact_site_admin=Please contact your site administrator.
labels.request_error_title=Invalid Request Format.
labels.bad_request=Your request to the URL is invalid.
labels.page_not_found_title=Page Not Found.
labels.check_url=Please check the URL.
labels.user_name=Username
labels.login=Login
labels.login.placeholder_username=Username
labels.login.placeholder_password=Password
labels.login.title=Login

labels.contact_site_admin=Please contact your site administrator.
labels.request_error_title=Invalid Request Format.
labels.bad_request=Your request to the URL is invalid.
labels.page_not_found_title=Page Not Found.
labels.check_url=Please check the URL.
labels.user_name=Username
labels.login=Login
labels.login.placeholder_username=Username
labels.login.placeholder_password=Password
labels.login.title=Login

    /** The key of the message: Your request to the URL is invalid. */
    public static final String LABELS_bad_request = "{labels.bad_request}";

    /** The key of the message: Page Not Found. */
    public static final String LABELS_page_not_found_title = "{labels.page_not_found_title}";

    /** The key of the message: Please check the URL. */