if (fessConfig.getIndexerThreadDumpEnabledAsBoolean()) {
                        ThreadDumpUtil.printThreadDump();
                    }
                    org.codelibs.fess.exec.Crawler.addError("QueueTimeout");
                }

                if (!ComponentUtil.available()) {
                    logger.info("IndexUpdater is terminated.");
                    forceStop();
                    break;