if (cleanupTime >= 0) {
                buf.append(", cleanup ").append(cleanupTime).append("ms");
            }
            buf.append("}, ");
            buf.append(MemoryUtil.getMemoryUsageLog());
            buf.append(')');
            logger.info(buf.toString());
        }
        final long unprocessedDocumentSize = fessConfig.getIndexerUnprocessedDocumentSizeAsInteger().longValue();