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Discovery plugins extend Elasticsearch by adding new seed hosts providers that can be used to extend the cluster formation module.
The core discovery plugins are:
EC2 discovery : The EC2 discovery plugin uses the AWS API to identify the addresses of seed hosts.
Azure Classic discovery : The Azure Classic discovery plugin uses the Azure Classic API to identify the addresses of seed hosts.
GCE discovery : The Google Compute Engine discovery plugin uses the GCE API to identify the addresses of seed hosts.