* @throws SsoLoginException if SPNEGO initialization fails
     */
    protected synchronized org.codelibs.spnego.SpnegoAuthenticator getAuthenticator() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        if (authenticator != null && fessConfig.getSystemPropertyAsBoolean(SPNEGO_INITIALIZED, false)) {
            return authenticator;
        }
        try {
            // set some System properties

     */
    public static void validateFields(final Map<String, Object> doc, final Consumer<VaMessenger<FessMessages>> throwError) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        try {
            if (!fessConfig.validateIndexRequiredFields(doc)) {
                throwError.accept(messages -> fessConfig.invalidIndexRequiredFields(doc)
                        .stream()

    }

    /**
     * Gets the default page size from configuration.
     * @return The default page size.
     */
    protected int getDefaultPageSize() {
        return ComponentUtil.getFessConfig().getPagingPageSizeAsInteger();
    }

    }

    /**
     * Gets the default page size from configuration.
     *
     * @return The default number of records per page
     */
    protected int getDefaultPageSize() {
        return ComponentUtil.getFessConfig().getPagingPageSizeAsInteger();
    }

    /**
     * Gets the default current page number.
     *
     * @return The default current page number (1)
     */
    protected int getDefaultCurrentPageNumber() {

    }

    /**
     * Gets the default page size from configuration.
     *
     * @return The default page size
     */
    protected int getDefaultPageSize() {
        return ComponentUtil.getFessConfig().getPagingPageSizeAsInteger();
    }

     * @param configList list of data configurations to crawl
     */
    protected void doCrawl(final String sessionId, final List<DataConfig> configList) {
        final int multiprocessCrawlingCount = ComponentUtil.getFessConfig().getCrawlingThreadCount();

        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        final long startTime = systemHelper.getCurrentTimeAsLong();

     * Returns the default page size from the system configuration.
     *
     * @return the default page size configured in the system
     */
    protected int getDefaultPageSize() {
        return ComponentUtil.getFessConfig().getPagingPageSizeAsInteger();
    }

        try (CurlResponse response = ComponentUtil.getCurlHelper()
                .get("/_configsync/file")
                .param("fields", "path,@timestamp")
                .param("size", ComponentUtil.getFessConfig().getPageDictionaryMaxFetchSize())
                .execute()) {
            final Map<String, Object> contentMap = response.getContent(OpenSearchCurl.jsonParser());
            @SuppressWarnings("unchecked")

            Runtime.getRuntime().addShutdownHook(shutdownCallback);

            systemMonitorTask = TimeoutManager.getInstance()
                    .addTimeoutTarget(new SystemMonitorTarget(), ComponentUtil.getFessConfig().getThumbnailSystemMonitorIntervalAsInteger(),
                            true);

            final int totalCount = process(options);
            if (totalCount != 0) {

        final RequestHeaderService requestHeaderService = ComponentUtil.getComponent(RequestHeaderService.class);
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        // HttpClient Parameters
        final Map<String, Object> paramMap = new HashMap<>();
        factory.setInitParameterMap(paramMap);