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[8.9] [DOC+] ILM min_age interpretation (#98245) #98853

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Aug 24, 2023
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[8.9] [DOC+] ILM min_age interpretation (#98245) #98853

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14 changes: 14 additions & 0 deletions docs/reference/ilm/error-handling.asciidoc
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Expand Up @@ -149,6 +149,20 @@ POST /my-index-000001/_ilm/retry
{ilm-init} subsequently attempts to re-run the step that failed.
You can use the <<ilm-explain-lifecycle,{ilm-init} Explain API>> to monitor the progress.


[discrete]
=== Common {ilm-init} setting issues

[discrete]
==== How `min_age` is calculated

When setting up an <<set-up-lifecycle-policy,{ilm-init} policy>> or <<getting-started-index-lifecycle-management,automating rollover with {ilm-init}>>, be aware that`min_age` can be relative to either the rollover time or the index creation time.

If you use <<ilm-rollover,{ilm-init} rollover>>, `min_age` is calculated relative to the time the index was rolled over. This is because the <<indices-rollover-index,rollover API>> generates a new index. The `creation_date` of the new index (retrievable via <<indices-get-settings>>) is used in the calculation. If you do not use rollover in the {ilm-init} policy, `min_age` is calculated relative to the `creation_date` of the original index.

You can override how `min_age` is calculated using the `index.lifecycle.origination_date` and `index.lifecycle.parse_origination_date` <<ilm-settings,{ilm-init} settings>>.


[discrete]
=== Common {ilm-init} errors

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