Add: alert writes to elasticsearch

[Zhang21]

增加支持将Prometheus告警记录写入到Elasticsearch7.x，可通过Kibana进行界面查看告警记录和配置表格导出。

[feiyu563]

非常感谢

[trestea]

使用es7.14 并没有存储告警信息，配置如下：
#是否开启告警记录 0为关闭,1为开启
AlertRecord=1
alert_to_es=1
to_es_url=http://10.170.3.11:9200
to_es_user=elastic
to_es_pwd=fdasrer

[Zhang21]

使用es7.14 并没有存储告警信息，配置如下： #是否开启告警记录 0为关闭,1为开启 AlertRecord=1 alert_to_es=1 to_es_url=http://10.170.3.11:9200 to_es_user=elastic to_es_pwd=fdasrer

你提个issue，写下应用的tag和commit，贴下程序启动时候的日志。

[junun]

1， app.conf
AlertRecord=1
alert_to_es=1
to_es_url=http://x.x.x.x:9200/
to_es_user=elastic
to_es_pwd=xxxx

2, version info
2023/04/06 17:57:41.809 [I] [proc.go:255] [main] 构建的Go版本: go1.17.5
2023/04/06 17:57:41.809 [I] [proc.go:255] [main] 应用当前版本: 'v4.8.2'
2023/04/06 17:57:41.809 [I] [proc.go:255] [main] 应用当前提交: eb8600a
2023/04/06 17:57:41.809 [I] [proc.go:255] [main] 应用构建时间: 2022-06-24T15:42:46+0800
2023/04/06 17:57:41.809 [I] [proc.go:255] [main] 应用构建用户: root@bogon
2023/04/06 17:57:41.828 [I] [asm_amd64.s:1581] http server Running on http://0.0.0.0:8080

3, error log：
2023/04/06 16:05:57.678 [E] [prometheusalert.go:372] [elasticsearch] Index a prometheusalert alert to es error: elastic: Error 400 (Bad Request): Rejecting mapping update to [prometheusalert-20234] as the final mapping would have more than 1 type: [_doc, prometheusalert] [type=illegal_argument_exception]

4, es version
7.10.1