public void close() {
        if (runner != null) {
            try {
                client.admin()
                        .indices()
                        .prepareFlush()
                        .setForce(true)
                        .execute()
                        .actionGet(ComponentUtil.getFessConfig().getIndexIndicesTimeout());
            } catch (final Exception e) {

                return Collections.emptyList();
            }
        };
        ComponentUtil.register(requestHeaderService, RequestHeaderService.class.getCanonicalName());

        final SetOnce<Map<String, Object>> initParamMapSet = new SetOnce<>();
        WebConfig webConfig = new WebConfig();
        webConfig.setUserAgent(Constants.CRAWLING_USER_AGENT_PREFIX + "1.0" + Constants.CRAWLING_USER_AGENT_SUFFIX);

        // When/Then
        assertThrows(IllegalArgumentException.class, () -> {
            transformHeader.setNonce(shortNonce);
        });

        assertThrows(IllegalArgumentException.class, () -> {
            transformHeader.setNonce(longNonce);
        });
    }

    @Test
    @DisplayName("Should handle null signature")
    void testNullSignature() {
        // When/Then

        this.setComponents(clone(original.getMojos(), this));
        this.setId(original.getId());
        this.setIsolatedRealm(original.isIsolatedRealm());
        this.setSource(original.getSource());
        this.setDependencies(original.getDependencies());
        this.setDependencyNode(original.getDependencyNode());
    }

        assertEquals(1, collector2.getProblems().size());
    }

    @Test
    void testAddProblem() {
        ProblemCollector collector = ProblemCollectorFactory.newInstance(null);
        collector.setSource("pom.xml");
        collector.add(Problem.Severity.ERROR, "Error message", 10, 5, null);
        collector.add(Problem.Severity.WARNING, "Warning message", 15, 3, null);

        List<Problem> problems = collector.getProblems();

                    source.put("timestamp", event.getTimestamp());
                    bulkRequest.add(client.prepareIndex().setIndex(indexName).setSource(source));
                }
                final BulkResponse response = bulkRequest.execute().actionGet(30_000L);
                if (response.hasFailures()) {

        Settings userSettings = readSettings(userSettingsSource, request, problems);

        settingsMerger.merge(userSettings, globalSettings, TrackableBase.GLOBAL_LEVEL);

        problems.setSource("");

        userSettings = interpolate(userSettings, request, problems);

        // for the special case of a drive-relative Windows path, make sure it's absolute to save plugins from trouble

    }

    protected IndexRequestBuilder createInsertRequest(final EsAbstractEntity esEntity) {
        final IndexRequestBuilder builder = client.prepareIndex().setIndex(asEsIndex()).setSource(toSource(esEntity));
        final String id = esEntity.asDocMeta().id();
        if (id != null) {
            builder.setId(id);
        }

    }

    /**
     * Sets the nonce for encryption
     *
     * @param nonce
     *            the nonce to set (12 bytes for CCM, 16 bytes for GCM)
     */
    public void setNonce(final byte[] nonce) {
        if (nonce.length == 12) {
            // For CCM cipher, pad nonce to 16 bytes with zeros
            java.util.Arrays.fill(this.nonce, (byte) 0);

    }

    protected IndexRequestBuilder createInsertRequest(final EsAbstractEntity esEntity) {
        final IndexRequestBuilder builder = client.prepareIndex().setIndex(asEsIndex()).setSource(toSource(esEntity));
        final String id = esEntity.asDocMeta().id();
        if (id != null) {
            builder.setId(id);
        }