// State has changed
                return true;
            }

            @Override
            public String getHostname() {
                return "test-hostname";
            }
        };

        FessConfig fessConfig = createTestFessConfig();

        // Register components
        ComponentUtil.register(searchEngineClient, "searchEngineClient");

    }

    /**
     * Set the value of hostname, used in parameter comment. <br>
     * Even if empty string, treated as empty plainly. So "IF pmb != null" is false if empty.
     * @param hostname The parameter value of hostname. (NotNull)
     */
    public void setHostname(String hostname) {
        registerVariable("hostname", hostname);
    }

    /**

                                    <label for="hostname" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.file_auth_hostname"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="hostname"/>
                                        <la:text styleId="hostname" property="hostname" styleClass="form-control"/>

                                    <label for="hostname" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.webauth_hostname"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="hostname"/>
                                        <la:text styleId="hostname" property="hostname" styleClass="form-control"/>

        final String hostname = ComponentUtil.getSystemHelper().getHostname();
        final String targetName = ComponentUtil.getFessConfig().getSchedulerTargetName();

        final String body = toJson(Map.of( //
                "type", TYPE_HEARTBEAT, //
                "instanceId", instanceId, //
                "hostname", hostname, //

                                        <th style="width: 25%"><la:message
                                                key="labels.file_auth_hostname"/></th>
                                        <td>${f:h(hostname)}<la:hidden property="hostname"/></td>
                                    </tr>
                                    <tr>
                                        <th><la:message key="labels.file_auth_port"/></th>

        }

        final int searchSize = fessConfig.getLogNotificationSearchSizeAsInteger();
        final String hostname = ComponentUtil.getSystemHelper().getHostname();
        final SearchResponse searchResponse = client.prepareSearch(indexName)
                .setQuery(QueryBuilders.termQuery("hostname", hostname))
                .setSize(searchSize)
                .addSort("timestamp", SortOrder.ASC)
                .execute()

    }

    /**
     * Gets the hostname of the local machine.
     *
     * @return The hostname.
     */
    public String getHostname() {
        final Map<String, String> env = getEnvMap();
        if (env.containsKey("COMPUTERNAME")) {
            return env.get("COMPUTERNAME");
        }
        if (env.containsKey("HOSTNAME")) {
            return env.get("HOSTNAME");
        }
        try {

{
  "properties": {
    "hostname": {
      "type": "keyword"
    },
    "level": {
      "type": "keyword"
    },
    "loggerName": {
      "type": "keyword"
    },
    "message": {
      "type": "text",
      "index": false
    },
    "throwable": {
      "type": "text",
      "index": false
    },
    "timestamp": {
      "type": "date",
      "format": "epoch_millis"
    }
  }

                for (final LogNotificationEvent event : batch) {
                    final Map<String, Object> source = new HashMap<>();
                    source.put("hostname", hostname);
                    source.put("level", event.getLevel());
                    source.put("loggerName", event.getLoggerName());
                    source.put("message", event.getMessage());