return this;
    }

    @Override
    public String execute() {
        //   check # of crawler processes
        final int maxCrawlerProcesses = ComponentUtil.getFessConfig().getJobMaxCrawlerProcessesAsInteger();
        if (maxCrawlerProcesses > 0) {
            final int runningJobCount = getRunningJobCount();
            if (runningJobCount > maxCrawlerProcesses) {
                throw new JobProcessingException(

     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     * @throws NumberFormatException When the property is not integer.
     */
    Integer getJobMaxCrawlerProcessesAsInteger();

    /**
     * Get the value for the key 'job.default.script'. <br>
     * The value is, e.g. groovy <br>