*
     * @return the serializer type (either "kryo" or "javabin")
     */
    protected String getSerializerType() {
        return ComponentUtil.getFessConfig().getCrawlerDataSerializer();
    }

    /**
     * Serializes an object to a byte array.
     * <p>
     * The serialization method used depends on the configured serializer type.

     * comment: Serializer type for crawler data (e.g., kryo).
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCrawlerDataSerializer();

    /**
     * Get the value for the key 'crawler.document.max.site.length'. <br>
     * The value is, e.g. 100 <br>
     * comment: Maximum length of site name in documents.