In the Monitoring tab of the Amazon Elasticsearch Service console, a cluster appears to have twice the number of nodes that I originally provisioned for it. Why?

Amazon ES uses blue/green deployments to make most cluster configuration changes. During this process, Amazon ES provisions a new cluster with the specified number of nodes and copies the entire dataset from the existing cluster to the new cluster. When the data migration is complete, Amazon ES terminates the existing cluster and the number of nodes returns to normal. For more information, see About Configuration Changes.

Note: Amazon ES does not use blue/green deployments for access policy changes or changes to the automated snapshot hour.

For more information about how you are charged during configuration changes, see Charges for Configuration Changes.

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Published: 2016-11-03

Updated: 2018-10-29