// Inject dependencies
        indexUpdater.searchEngineClient = searchEngineClient;
        indexUpdater.dataService = dataService;
        indexUpdater.urlQueueService = urlQueueService;
        indexUpdater.urlFilterService = urlFilterService;
        indexUpdater.clickLogBhv = clickLogBhv;
        indexUpdater.favoriteLogBhv = favoriteLogBhv;
        indexUpdater.systemHelper = systemHelper;

    private static final String DATA_SERVICE = "dataService";

    private static final String MESSAGE_MANAGER = "messageManager";

    private static final String INDEX_UPDATER = "indexUpdater";

    private static final String FILE_TYPE_HELPER = "fileTypeHelper";

    private static final String EXTRACTOR_FACTORY = "extractorFactory";