elasticsearch/docs/reference/migration/migrate_8_0/allocation.asciidoc
David Turner bc31ea752e
Always auto-release the flood-stage block (#45274)
Removes support for using a system property to disable the automatic release of
the write block applied when a node exceeds the flood-stage watermark.

Relates #42559
2019-08-08 11:47:14 +01:00

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[[breaking_80_allocation_changes]]
=== Allocation changes
//NOTE: The notable-breaking-changes tagged regions are re-used in the
//Installation and Upgrade Guide
//tag::notable-breaking-changes[]
// end::notable-breaking-changes[]
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[[breaking_80_allocation_change_flood_stage_block_always_removed]]
==== Auto-release flood-stage block no longer optional
If a node exceeds the flood-stage disk watermark then we add a block to all of
its indices to prevent further writes as a last-ditch attempt to prevent the
node completely exhausting its disk space. By default, from 7.4 onwards the
block is automatically removed when a node drops below the high watermark
again, but this behaviour could be disabled by setting the system property
`es.disk.auto_release_flood_stage_block` to `false`. This behaviour is no
longer optional, and this system property must now not be set.