// Create multiple threads that all try to connect simultaneously
        for (int i = 0; i < threadCount; i++) {
            new Thread(() -> {
                try {
                    startLatch.await(); // Wait for signal to start
                    conn.connect();
                    successCount.incrementAndGet();
                } catch (Exception e) {
                    synchronized (exceptions) {

                logger.error("Failed to update suggest index.", t);
                exitCode.set(1);
                latch.countDown();
            });

            try {
                latch.await();
            } catch (final InterruptedException ignore) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Interrupted.", ignore);
                }
                exitCode.set(1);

        // Create multiple threads that all try to connect simultaneously
        for (int i = 0; i < threadCount; i++) {
            new Thread(() -> {
                try {
                    startLatch.await(); // Wait for signal to start
                    conn.connect();
                    successCount.incrementAndGet();
                } catch (Exception e) {
                    synchronized (exceptions) {

            } finally {
                latch.countDown();
            }
        });

        otherThread.start();
        latch.await();

        // Verify other thread had different values
        assertEquals("other-thread", otherThreadUrlQueueSessionId.get());
        assertEquals("other-context", otherThreadContextSessionId.get());

            latch.countDown();
        }).error(t -> {
            t.printStackTrace();
            latch.countDown();
            fail();
        });
        latch.await();
        assertEquals(num, numObInputDoc.get());

        SuggestResponse response = suggester.suggest().setQuery("test").setSuggestDetail(true).execute().getResponse();
        assertEquals(1, response.getNum());
    }

				"application/x-rar-compressed",
				"application/x-roxio-toast",
				"application/x-rpm",
				"application/x-sas",
				"application/x-sas-program-data",
				"application/x-sas-audit",
				"application/x-sas-data",
				"application/x-sas-view",
				"application/x-sas-data-index",
				"application/x-sas-catalog",
				"application/x-sas-access",
				"application/x-sas-fdb",

app.digest.algorism=sha256
# Regex pattern for properties to encrypt.
app.encrypt.property.pattern=.*password|.*key|.*token|.*secret

# Extension names for application customization.
app.extension.names=

# Audit log format.
app.audit.log.format=

# JVM options for the crawler process.
jvm.crawler.options=\
-Djava.awt.headless=true\n\
-Dfile.encoding=UTF-8\n\
-Djna.nosys=true\n\
-Djdk.io.permissionsUseCanonicalPath=true\n\

    /**
     * Get the value for the key 'app.audit.log.format'. <br>
     * The value is, e.g.  <br>
     * comment: Audit log format.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getAppAuditLogFormat();

    /**
     * Get the value for the key 'app.audit.log.format' as {@link Integer}. <br>
     * The value is, e.g.  <br>