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);

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

          <code>
            <![CDATA[
    public static final String SOURCE_POM = "pom";

    public static final String SOURCE_SETTINGS = "settings.xml";

    public void setSource(String source) {
        getDelegate().setSource(source);
    }

    public String getSource() {
        return getDelegate().getSource();
    }

    /**
     * @see java.lang.Object#toString()
     */