建议保留 container_id

[rmrf]

libbeat/processors/actions/tag_lain_fields.go line: 75

    event.Delete("container_id")

container id 在很多场景下都十分有用，尤其是在对比日志文件的过程中。

[wchaoyi]

@ericpai

[ericpai]

@wchaoyi 这行代码去掉就可以 https://github.com/laincloud/beats/blob/feature_lain/libbeat/processors/actions/tag_lain_fields.go#L75