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Merged
merged 3 commits into from
Jan 29, 2025
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(Doc+) Expand watermark resolution #119174

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(Doc+) Expand watermark resolution
kunisen Dec 20, 2024
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Merge branch 'main' into kunisen-docpr-es-116892
shainaraskas Dec 23, 2024
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leemthompo Jan 29, 2025
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36 changes: 25 additions & 11 deletions docs/reference/troubleshooting/common-issues/disk-usage-exceeded.asciidoc
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Expand Up @@ -53,7 +53,7 @@ GET _cluster/allocation/explain
[[fix-watermark-errors-temporary]]
==== Temporary Relief

To immediately restore write operations, you can temporarily increase the
To immediately restore write operations, you can temporarily increase
<<disk-based-shard-allocation,disk watermarks>> and remove the
<<index-block-settings,write block>>.

Expand Down Expand Up @@ -102,19 +102,33 @@ PUT _cluster/settings
[[fix-watermark-errors-resolve]]
==== Resolve

As a long-term solution, we recommend you do one of the following best suited
to your use case:
To resolve watermark errors permanently, perform one of the following actions:

* add nodes to the affected <<data-tiers,data tiers>>
+
TIP: You should enable <<xpack-autoscaling,autoscaling>> for clusters deployed using our {ess}, {ece}, and {eck} platforms.
* Horizontally scale nodes of the affected <<data-tiers,data tiers>>.

* upgrade existing nodes to increase disk space
+
TIP: On {ess}, https://support.elastic.co[Elastic Support] intervention may
become necessary if <<cluster-health,cluster health>> reaches `status:red`.
* Vertically scale existing nodes to increase disk space.

* delete unneeded indices using the <<indices-delete-index,delete index API>>
* Delete indices using the <<indices-delete-index,delete index API>>, either
permanently if the index isn't needed, or temporarily to later
<<snapshots-restore-snapshot,restore>>.

* update related <<index-lifecycle-management,ILM policy>> to push indices
through to later <<data-tiers,data tiers>>

TIP: On {ess} and {ece}, indices may need to be temporarily deleted via
its {cloud}/ec-api-console.html[Elasticsearch API Console] to later
<<snapshots-restore-snapshot,snapshot restore>> in order to resolve
<<cluster-health,cluster health>> `status:red` which will block
{cloud}/ec-activity-page.html[attempted changes]. If you experience issues
with this resolution flow on {ess}, kindly reach out to
https://support.elastic.co[Elastic Support] for assistance.
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can we explain why they have to do the deletion here? how does someone determine if this note applies to them?


== Prevent watermark errors

To avoid watermark errors in future, , perform one of the following actions:

* If you're using {ess}, {ece}, or {eck}: Enable <<xpack-autoscaling,autoscaling>>.

* Set up {kibana-ref}/kibana-alerts.html[stack monitoring alerts] on top of
<<monitor-elasticsearch-cluster,{es} monitoring>> to be notified before
the flood-stage watermark is reached.