[Collector] 能否支持es数据删除（让es中每种数据都按日期建立索引名称来存储，删除时按日期，逻辑上改动貌似不大）

[siyuan494]

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[wu-sheng]

after #547 merged, we can do this tiny adjustments.

[wu-sheng]

We will add time column in segments table.

[wu-sheng]

We will add time column in segments table.

Done. But no mechanism to delete data automatically. cc @peng-yongsheng

[wu-sheng]

Closing this. Already supported.