/** The key of the configuration. e.g. -1 */
    String SEARCHLOG_AGG_SHARD_SIZE = "searchlog.agg.shard.size";

    /** The key of the configuration. e.g.  */
    String SEARCHLOG_REQUEST_HEADERS = "searchlog.request.headers";

    /** The key of the configuration. e.g. 100 */
    String SEARCHLOG_PROCESS_batch_size = "searchlog.process.batch_size";

    /** The key of the configuration. e.g. 100 */