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Clarify high availability recommendations in Elasticsearch orchestration docs #8151

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Co-authored-by: Peter Brachwitz <peter.brachwitz@elastic.co>
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stefnestor and pebrc authored Oct 24, 2024
commit 39757ad733eec87313a1f6551e77bb4ea48b5a3d
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Expand Up @@ -149,7 +149,7 @@ Due to relying on Kubernetes primitives such as StatefulSets, the ECK orchestrat
** Single-node clusters
** Clusters containing indices with no replicas

If an {es} node holds the only copy of a shard, this shard becomes unavailable while the node is upgraded. link:{ref}/high-availability-cluster-design.html[Highly available] clusters are recommended, including having more than one node per link:{ref}/data-tiers.html[data tier] and at least one replica per index.
If an {es} node holds the only copy of a shard, this shard becomes unavailable while the node is upgraded. To ensure link:{ref}/high-availability-cluster-design.html[high availability] it is recommended to configure clusters with three master nodes, more than one node per link:{ref}/data-tiers.html[data tier] and at least one replica per index.

* Elasticsearch Pods may stay `Pending` during a rolling upgrade if the Kubernetes scheduler cannot re-schedule them back. This is especially important when using local PersistentVolumes. If the Kubernetes node bound to a local PersistentVolume does not have enough capacity to host an upgraded Pod which was temporarily removed, that Pod will stay `Pending`.

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