I've got my elasticsearch.yml file set to filter ec2 nodes during discovery based on a group and a tag. I use the same security group for all my ES nodes ( jsut filtering other running servers in my account ) and thus, when I want to run a separate cluster, I assign a new value to a tag called …

Prevent an ES Node from joining a cluster based on an EC2 Tag?

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Prevent an ES Node from joining a cluster based on an EC2 Tag?