* comment: Default script for the crawler (e.g., groovy).
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCrawlerDefaultScript();

    /**
     * Get the value for the key 'crawler.http.thread_pool.size'. <br>
     * The value is, e.g. 0 <br>
     * comment: Number of threads for HTTP crawling.