</plugin>
			<!-- rpm -->
			<plugin>
				<groupId>org.codehaus.mojo</groupId>
				<artifactId>rpm-maven-plugin</artifactId>
				<configuration>
					<distribution>Fess</distribution>
					<group>Application/Internet</group>
					<packager>CodeLibs</packager>
					<prefix>/usr</prefix>
					<needarch>noarch</needarch>
					<targetOS>linux</targetOS>
					<changelogFile>src/changelog</changelogFile>
					<defineStatements>

'[x-arrow]',\n  },\n\n  /**\n   * Modifier used to flip the popper's placement when it starts to overlap its\n   * reference element.\n   *\n   * Requires the `preventOverflow` modifier before it in order to work.\n   *\n   * **NOTE:** this modifier will interrupt the current update cycle and will\n   * restart it if it detects the need to flip the placement.\n   * @memberof modifiers\n   * @inner\n   */\n  flip: {\n    /** @prop {number} order=600 - Index used to define the order of execution */\n    order:...

            }
        }, "ThumbnailGenerator");
        thumbnailQueueThread.start();
    }

    @PreDestroy
    public void destroy() {
        generating = false;
        thumbnailQueueThread.interrupt();
        try {
            thumbnailQueueThread.join(10000);
        } catch (final InterruptedException e) {
            logger.warn("Thumbnail thread is timeouted.", e);
        }

            executor.awaitTermination(executorTerminationTimeout, TimeUnit.SECONDS);
        } catch (final InterruptedException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Failed to interrupt executor.", e);
            }
        } finally {
            executor.shutdownNow();
        }

        if (!deleteUrlList.isEmpty()) {
            deleteDocuments();
        }

            exitCode = Constants.EXIT_FAIL;
        } finally {
            if (commandThread != null && commandThread.isAlive()) {
                commandThread.interrupt();
            }
            if (systemMonitorTask != null) {
                systemMonitorTask.cancel();
            }
            if (hotThreadMonitorTask != null) {
                hotThreadMonitorTask.cancel();

nt:before{content:"\f03c"}.fa-industry:before{content:"\f275"}.fa-infinity:before{content:"\f534"}.fa-info:before{content:"\f129"}.fa-info-circle:before{content:"\f05a"}.fa-instagram:before{content:"\f16d"}.fa-intercom:before{content:"\f7af"}.fa-internet-explorer:before{content:"\f26b"}.fa-invision:before{content:"\f7b0"}.fa-ioxhost:before{content:"\f208"}.fa-italic:before{content:"\f033"}.fa-itch-io:before{content:"\f83a"}.fa-itunes:before{content:"\f3b4"}.fa-itunes-note:before{content:"\f3b5"}...

nt:before{content:"\f03c"}.fa-industry:before{content:"\f275"}.fa-infinity:before{content:"\f534"}.fa-info:before{content:"\f129"}.fa-info-circle:before{content:"\f05a"}.fa-instagram:before{content:"\f16d"}.fa-intercom:before{content:"\f7af"}.fa-internet-explorer:before{content:"\f26b"}.fa-invision:before{content:"\f7b0"}.fa-ioxhost:before{content:"\f208"}.fa-italic:before{content:"\f033"}.fa-itch-io:before{content:"\f83a"}.fa-itunes:before{content:"\f3b4"}.fa-itunes-note:before{content:"\f3b5"}...

        if (jobProcess != null) {
            final InputStreamThread ist = jobProcess.getInputStreamThread();
            try {
                ist.interrupt();
            } catch (final Exception e) {
                logger.warn("Could not interrupt a thread of an input stream.", e);
            }

            final CountDownLatch latch = new CountDownLatch(3);
            final Process process = jobProcess.getProcess();

            throw new CommandExecutionException("Process terminated.", e);
        } finally {
            if (mt != null) {
                mt.setFinished(true);
                try {
                    mt.interrupt();
                } catch (final Exception e) {
                    // ignore
                }
            }
            if (currentProcess != null) {
                try {

            }

            executed.set(true);

            if (logger.isDebugEnabled()) {
                logger.debug("Interrupting a stream thread.");
            }
            ist.interrupt();

            CommonPoolUtil.execute(() -> {
                try {
                    CloseableUtil.closeQuietly(p.getInputStream());
                } catch (final Exception e) {