} catch (final UnknownHostException e) {
            throw new FessSystemException("Failed to resolve the hostname: " + host, e);
        }
    }

    /**
     * Initializes the search engine client and configures indices.
     * Called automatically after dependency injection is complete.
     */
    @PostConstruct
    public void open() {
        if (logger.isDebugEnabled()) {

getComputedStyle(this._element).overflowY === 'visible' ? null : this._element\n    this._activeTarget = null\n    this._observer = null\n    this._previousScrollData = {\n      visibleEntryTop: 0,\n      parentScrollTop: 0\n    }\n    this.refresh() // initialize\n  }\n\n  // Getters\n  static get Default() {\n    return Default\n  }\n\n  static get DefaultType() {\n    return DefaultType\n  }\n\n  static get NAME() {\n    return NAME\n  }\n\n  // Public\n  refresh() {\n    this._initializeTargetsAndObservables()\n...