/** The key of the configuration. e.g. 60000 */
    String INDEX_BACKUP_LOG_LOAD_TIMEOUT = "index.backup.log.load.timeout";

    /** The key of the configuration. e.g. org.codelibs,org.dbflute,org.lastaflute */
    String LOGGING_APP_PACKAGES = "logging.app.packages";

    /** The key of the configuration. e.g. true */
    String LOGGING_SEARCH_DOCS_ENABLED = "logging.search.docs.enabled";