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[DOCS] Add deprecation docs for low ILM poll intervals (#77733) (#78094)
We deprecated ILM poll intervals of less than 1 second in 7.2 with PR #41096 However, we didn't add a related item to the 7.2 deprecation docs. This adds the missing item. Relates to #41095.
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docs/reference/migration/migrate_7_2.asciidoc

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@@ -9,6 +9,9 @@ your application to Elasticsearch 7.2.
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See also <<release-highlights>> and <<es-release-notes>>.
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* <<breaking_72_discovery_changes>>
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* <<breaking_72_ilm_deprecations>>
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//NOTE: The notable-breaking-changes tagged regions are re-used in the
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//Installation and Upgrade Guide
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@@ -27,4 +30,17 @@ unexpectedly ignored the rest. For instance if you set `discovery.seed_hosts:
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"10.11.12.13:9300-9310"` then {es} would only use `10.11.12.13:9300` for
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discovery. Seed host addresses containing port ranges are now rejected.
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[discrete]
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[[breaking_72_ilm_deprecations]]
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=== {ilm-cap} ({ilm-init}) deprecations
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[discrete]
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[[deprecate-ilm-poll-interval-1s]]
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==== An {ilm-init} poll interval of less than one second is deprecated.
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Setting `indices.lifecycle.poll_interval` to less than one second (`1s`) is now
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deprecated. If the `indices.lifecycle.poll_interval` cluster setting is too low,
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it can cause excessive load on a cluster.
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To avoid deprecation warnings, use a setting value of `1s` or greater.
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// end::notable-breaking-changes[]

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