* The value is, e.g. true <br>
     * comment: Whether document cache is enabled.
     * @return The determination, true or false. (if not found, exception but basically no way)
     */
    boolean isCrawlerDocumentCacheEnabled();

    /**
     * Get the value for the key 'crawler.document.cache.max.size'. <br>
     * The value is, e.g. 2621440 <br>
     * comment: Maximum size (bytes) for document cache.