}
                    // terminate crawling
                    finishCrawling = true;
                    forceStop();
                    if (fessConfig.getIndexerThreadDumpEnabledAsBoolean()) {
                        ThreadDumpUtil.printThreadDump();
                    }
                    org.codelibs.fess.exec.Crawler.addError("QueueTimeout");
                }

        return Constants.TRUE.equalsIgnoreCase(getApiAccessTokenRequired());
    }

    String getIndexerThreadDumpEnabled();

    default boolean getIndexerThreadDumpEnabledAsBoolean() {
        return Constants.TRUE.equalsIgnoreCase(getIndexerThreadDumpEnabled());
    }

    String getIndexBackupTargets();

    String getIndexBackupLogTargets();