logstah filter grok demo： 连接

logstash filter date 使用date模块修改日期时间 : 连接

logstash filter user_agent - 客户端设备案例: 连接：

logstash filter geoip - 地理位置案例: 连接

logstash filter mutate 组件实战案例 ： 连接

删除 字段和更改字段：

参考链接：
https://www.elastic.co/guide/en/logstash/7.17/plugins-filters-grok.html
https://www.elastic.co/guide/en/logstash/7.17/plugins-filters-date.html
https://www.elastic.co/guide/en/logstash/7.17/plugins-filters-useragent.html
https://www.elastic.co/guide/en/logstash/7.17/plugins-filters-geoip.html
https://www.elastic.co/guide/en/logstash/7.17/plugins-filters-mutate.html