if (fessConfig.availableProcessors() >= 4) {
                return null;
            }
            final String requestsPerSecond = String.valueOf(fessConfig.getIndexReindexSizeAsInteger() * fessConfig.availableProcessors());
            logger.info("Set requests_per_second to {}", requestsPerSecond);
            return requestsPerSecond;
        }
        return value;
    }