/** The key of the configuration. e.g.  */
    String SCHEDULER_TARGET_NAME = "scheduler.target.name";

    /** The key of the configuration. e.g. org.codelibs.fess.app.job.ScriptExecutorJob */
    String SCHEDULER_JOB_CLASS = "scheduler.job.class";

    /** The key of the configuration. e.g. QUIT */
    String SCHEDULER_CONCURRENT_EXEC_MODE = "scheduler.concurrent.exec.mode";