*/
    protected String getReindexRequestsPerSecound(final FessConfig fessConfig) {
        if (StringUtil.isBlank(fessConfig.getIndexReindexRequestsPerSecond())) {
            return null;
        }
        final String value = fessConfig.getIndexReindexRequestsPerSecond();
        if ("adaptive".equalsIgnoreCase(value)) {
            if (fessConfig.availableProcessors() >= 4) {
                return null;