* retrieving popular words and indexing suggestions.
 *
 * <p>Constructor:
 * <ul>
 *   <li>{@link #Suggester(Client, SuggestSettings, ReadingConverter, ReadingConverter, Normalizer, SuggestAnalyzer, ExecutorService)}: Initializes a new instance of the Suggester class.</li>
 * </ul>
 *
 * <p>Public Methods:
 * <ul>
 *   <li>{@link #suggest()}: Creates a new SuggestRequestBuilder for querying suggestions.</li>

        this.client = client;
        this.settings = settings;
        analyzerSettingsIndexName = createAnalyzerSettingsIndexName(settingsIndexName);
    }

    /**
     * Initializes the analyzer settings.
     * If the analyzer settings index does not exist, it creates it with default settings and mappings.
     * It also loads analyzer names and field analyzer mappings.
     */

     */
    protected String searchPreference;

    /**
     * Target indices.
     */
    protected String[] targetIndices;

    /**
     * Creates a new instance of FesenClient.
     * Initializes the address and target indices from system properties.
     */
    public FesenClient() {
        address = System.getProperty(HTTP_ADDRESS, "localhost:9200").trim();

            StringUtil.EMPTY//
    };

    /** SSL socket factory for HTTPS connections */
    protected LayeredConnectionSocketFactory sslSocketFactory;

    /**
    * Initializes the HTTP client with the necessary configurations and settings.
    * This method sets up the request configurations, authentication schemes,
    * user agent, proxy settings, request headers, cookie store, and connection manager.