/** The key of the configuration. e.g. -1 */
    String RANK_FUSION_THREADS = "rank.fusion.threads";

    /** The key of the configuration. e.g. rf_score */
    String RANK_FUSION_score_field = "rank.fusion.score_field";

    /** The key of the configuration. e.g. true */
    String SMB_ROLE_FROM_FILE = "smb.role.from.file";