This plugin is deprecated and no more followed or maintained.
The etcd Cloud plugin allow to use etcd for the unicast discovery mechanism.
The purpose of that plugin is to discover the transport adresses of the other Elasticsearch nodes in a cluster with etcd access.
Let's say you have this configuration stored in etcd :
/services/<<myclustername>>/1/transport: {"host":"127.0.0.1","port":9300}
/services/<<myclustername>>/2/transport: {"host":"127.0.0.1","port":9301}
/services/<<myclustername>>/3/transport: {"host":"127.0.0.1","port":9302}
With this elasticsearch configuration :
cloud:
etcd:
host: http://localhost:4001
key: /services/<<myclustername>>
discovery:
type: etcd
Then elasticsearch will use unicast discovery and try to connect to the other nodes using the transport addresses set in etcd.
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