The autoscaling feature allows an operator to create tiers of nodes. These nodes monitor themselves to decide if they need to scale, based on an operator-defined policy. An Elasticsearch cluster can use the autoscaling API to report if it needs more resources to meet the policy. For example, an operator could define a policy that a warm tier should scale on available disk space. Elasticsearch monitors disk space in the warm tier. If it predicts low disk space for current and future shard copies, the autoscaling API will report that the cluster needs to scale. It remains the responsibility of the operator to add the additional resources that the cluster signals it requires.
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