} catch (final Exception e) {
            logger.warn("Failed to delete UrlFilter: sessionId={}", sid, e);
        }

        try {
            // clear queue
            urlQueueService.clearCache();
            urlQueueService.delete(sid);
        } catch (final Exception e) {
            logger.warn("Failed to delete UrlQueue: sessionId={}", sid, e);
        }

        try {

            thumbnailQueueThread.join(10000);
        } catch (final InterruptedException e) {
            logger.warn("Thumbnail thread timed out.", e);
        }
        generatorList.forEach(g -> {
            try {
                g.destroy();
            } catch (final Exception e) {
                logger.warn("Failed to stop thumbnail generator.", e);
            }
        });
    }

    /**

     * Processes the job.
     * @param runtime The job runtime.
     */
    protected void process(final LaJobRuntime runtime) {
        if (!runtime.getParameterMap().containsKey(Constants.SCHEDULED_JOB)) {
            logger.warn("Scheduled job is empty: key={}", Constants.SCHEDULED_JOB);
            return;
        }
        runtime.stopIfNeeds();

        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();

     */
    public static void printThreadDump() {
        processThreadDump(logger::info);
    }

    /**
     * Prints thread dump information to the logger at WARN level.
     */
    public static void printThreadDumpAsWarn() {
        processThreadDump(logger::warn);
    }

    /**
     * Prints thread dump information to the logger at ERROR level.
     */
    public static void printThreadDumpAsError() {

        } catch (final Exception e) {
            logger.warn("Failed to store crawling information: sessionId={}", options.sessionId, e);
        }

        try {
            return crawler.doCrawl(options);
        } finally {
            try {
                crawlingInfoHelper.store(options.sessionId, false);
            } catch (final Exception e) {

                            getUserBean())
                    .orElse(null);
        } catch (final Exception e) {
            logger.warn("Failed to request: {}", form.docId, e);
        }
        if (doc == null) {
            saveError(messages -> messages.addErrorsDocidNotFound(GLOBAL, form.docId));
            return redirect(ErrorAction.class);

                logger.warn("Could not add document: url field is missing or null");
                return;
            }

            final String url = dataMap.get(fessConfig.getIndexFieldUrl()).toString();
            final CrawlerClient client = crawlerClientFactory.getClient(url);
            if (client == null) {

                } catch (final SuggestSettingsException e) {
                    logger.warn("Failed to add suggest field: field={}", field, e);
                }
            }));
            suggester.createIndexIfNothing();
        } catch (final Exception e) {
            logger.warn("Failed to initialize Suggester.", e);
        }
    }

    /**
     * Gets the suggester instance.
     *

                }

                if (executeCommand(thumbnailId, cmdList) != 0) {
                    logger.warn("Failed to execute command for thumbnail ID: {}", thumbnailId);
                    if (outputFile.isFile() && !outputFile.delete()) {
                        logger.warn("Failed to delete output file: {}", outputFile.getAbsolutePath());
                    }
                    return false;
                }

                    }
                } catch (final Exception e) {
                    logger.warn("Failed to read a suggest bad word: {}", list, e);
                }
            }
            searchEngineClient.refresh("_all"); // TODO replace _all
        } catch (final IOException e) {
            logger.warn("Failed to read a suggest bad word.", e);
        }
    }

    /**