My Amazon ES cluster has more nodes than I originally provisioned
Last updated: 2020-02-07
In the Monitoring tab of the Amazon Elasticsearch Service (Amazon ES) console, a cluster appears to have twice the number of nodes than were originally provisioned. 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, copying 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.
Note: Amazon ES doesn't typically use blue/green deployments for changes to the access policy or automated snapshot hour. For more information, see About Configuration Changes.
For more information about how you are charged during configuration changes, see Charges for Configuration Changes.