protected Set<String> facetFieldSet;

    /** Array of fields that can be used for sorting search results */
    protected String[] sortFields;

    /** Set of fields that can be used for sorting for O(1) lookup */
    protected Set<String> sortFieldSet;

    /** Set of fields that are allowed in API responses */
    protected Set<String> apiResponseFieldSet;

    /** Set of fields that are not analyzed during indexing */

     *
     * @param userAgent the user agent string to match against directives,
     *                 can be null (treated as empty string)
     * @return the most specific matching directive, or null if no directive matches
     */
    public Directive getMatchedDirective(final String userAgent) {
        final String target;
        if (userAgent == null) {
            target = StringUtil.EMPTY;

     */
    @Size(max = 10)
    public String popularWord;

    /**
     * Character encoding to use for CSV file exports.
     * This setting affects the encoding of downloaded CSV files.
     */
    @Required
    @Size(max = 20)
    public String csvFileEncoding;

    /**
     * Number of days to keep search logs before purging.

    public static final String REDIRECTS_ENABLED = "redirectsEnabled";

    /** Property name for cookies setting */
    public static final String COOKIES_PROPERTY = "cookies";

    /** Property name for authentication scheme providers setting */
    public static final String AUTH_SCHEME_PROVIDERS_PROPERTY = "authSchemeProviders";

    /** Property name for ignore SSL certificate setting */

    }

    /**
     * Retrieves a specific user setting by ID.
     *
     * @param id the ID of the user setting to retrieve
     * @return JSON response containing the user setting
     */
    // GET /api/admin/user/setting/{id}
    @Execute
    public JsonResponse<ApiResult> get$setting(final String id) {
        return asJson(new ApiResult.ApiConfigResponse().setting(userService.getUser(id).map(this::createEditBody).orElseGet(() -> {

     * @param defaultValue The default value if the setting is not found.
     * @return The setting value as a String.
     */
    public String getAsString(final String key, final String defaultValue) {
        final Object obj = get(key);

        final String value;
        if (obj == null) {
            value = defaultValue;
        } else {
            value = obj.toString();
        }

            }

            if (logger.isDebugEnabled()) {
                logger.debug("Starting job: id={}, scriptType={}, script={}", id, scriptType, script);
            } else if (scheduledJob.isLoggingEnabled() && logger.isInfoEnabled()) {
                logger.info("Starting job: id={}", id);
            }

            final Object ret = jobExecutor.execute(Constants.DEFAULT_SCRIPT, script);

     *
     * @param input the input object (String[], List, or String)
     * @return joined string with elements separated by spaces, or empty string if invalid input
     */
    public static String join(final Object input) {
        String[] values = null;
        if (input instanceof String[]) {
            values = (String[]) input;
        } else if (input instanceof List) {

     * Starts a new thread for the crawler and optionally waits for its termination.
     * @return The session ID of the crawling process.
     */
    public String execute() {
        if (logger.isInfoEnabled()) {
            logger.info("Starting crawler execution: sessionId={}, background={}, daemon={}", crawlerContext.sessionId, background, daemon);
        }

     * @return an OptionalThing containing the pipeline string if found, or empty if not found or blank
     */
    public OptionalThing<String> getPipeline(final String configId) {
        final CrawlingConfig config = getCrawlingConfig(configId);
        if (config == null) {
            return OptionalThing.empty();
        }
        final String pipeline = config.getConfigParameterMap(ConfigName.CONFIG).get(Config.PIPELINE);