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大家好，我是好学的小师弟，今天和大家讨论下更新es索引生命周期策略后，策略何时对索引生效

结论:

若当前索引已应用策略A(旧)，更新完策略A后，新的策略A会立即对原来的已经应用该策略的索引生效；若当前索引符合新策略A的生命周期变化条件，则会自动进入下一阶段(hot-warm-cold-delete)

举例:

比方说原来策略是10g就滚动索引，你现在索引大小为8G，不符合滚动条件，但是你更新的策略为4G，那么更新策略完成后，等待一段时间(10分钟左右)，索引即可完成滚动，因为8G符合4g的滚动条件

具体细节:

1.几个关键字段  

以下字段value均是时间戳，通过观察三张图里的这些时间戳，即可得出结论:更新后的策略对原来已经应用该策略的索引，立即生效

lifecycle_date_millis: 指的是索引创建的时间戳，这里的索引指的是一开始创建这个索引的时间，或者是滚动后新索引的创建时间

phase_time_millis: 索引进入当前生命周期阶段的时间戳，以毫秒为单位

action: 当前生命周期阶段执行的操作，可能的值包括：complete、delete、rollover。

action_time_millis: 执行当前操作的时间戳，跟action字段对应

step_time_millis: 执行当前子步骤的时间戳，跟step字段对应

modified_date_in_millis: 索引生命周期策略的修改时间戳

2.更新完索引生命周期策略后，新策略已经对索引生效，索引目前处于check policy状态

{"indices": {"test_2023.03.21-000001": {"index": "test_2023.03.21-000001","managed": true,"policy": "test","lifecycle_date_millis": 1679394264357, //2023-03-21 18:24:24"age": "203.41d","phase": "hot","phase_time_millis": 1693479366940, //2023-08-31 18:56:06"action": "rollover","action_time_millis": 1679394338025, //2023-03-21 18:25:38"step": "check-rollover-ready","step_time_millis": 1693479366940, //2023-08-31 18:56:06"is_auto_retryable_error": true,"failed_step_retry_count": 2,"phase_execution": {"policy": "test","phase_definition": {"min_age": "3ms","actions": {"rollover": {"max_size": "4831838208b"},"set_priority": {"priority": 100}}},"version": 5,"modified_date_in_millis": 1696969009629 //2023-10-11 04:16:49}}}
}

3.更新完索引生命周期策略后，新策略已经对索引生效，索引符合新的策略的滚动条件，滚动中

{"indices": {"test_2023.03.21-000001": {"index": "test_2023.03.21-000001","managed": true,"policy": "test","lifecycle_date_millis": 1679394264357, //2023-03-21 18:24:24"age": "203.41d","phase": "hot","phase_time_millis": 1693479366940, //2023-08-31 18:56:06"action": "rollover","action_time_millis": 1679394338025, //2023-03-21 18:25:38"step": "attempt-rollover", //这里已经开始尝试滚动"step_time_millis": 1696969116221, //2023-10-11 04:18:36"phase_execution": {"policy": "test","phase_definition": {"min_age": "3ms","actions": {"rollover": {"max_size": "4831838208b"   //这里已经适配了最新的策略4.5G},"set_priority": {"priority": 100}}},"version": 5,"modified_date_in_millis": 1696969009629 //2023-10-11 04:16:49}}}
}

4.下面的是策略生效，索引滚动完毕,已经进入warm阶段

{"indices": {"test_2023.03.21-000001": {"index": "test_2023.03.21-000001","managed": true,"policy": "test","lifecycle_date_millis": 1696969219587, //2023-10-11 04:20:19"age": "13.12h","phase": "warm","phase_time_millis": 1696969755909, //2023-10-11 04:29:15"action": "complete","action_time_millis": 1696972068230, //2023-10-11 05:07:48"step": "complete","step_time_millis": 1696972068230, //2023-10-11 05:07:48"phase_execution": {"policy": "test","phase_definition": {"min_age": "5ms","actions": {"allocate": {"number_of_replicas": 0,"include": {},"exclude": {"box_type": "cold,hot"},"require": {"box_type": "warm"}},"forcemerge": {"max_num_segments": 1},"set_priority": {"priority": 50},"shrink": {"number_of_shards": 1}}},"version": 5,"modified_date_in_millis": 1696969009629 //2023-10-11 04:16:49}}}
}

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