The Amazon Web Service (AWS) Cloud plugin allows to use AWS API for the unicast discovery mechanism and add S3 repositories.
'org.elasticsearch.plugin:cloud-aws:2.1.2'
<dependency>
<groupId>org.elasticsearch.plugin</groupId>
<artifactId>cloud-aws</artifactId>
<version>2.1.2</version>
</dependency>
<dependency org="org.elasticsearch.plugin" name="cloud-aws" rev="2.1.2"/>
"org.elasticsearch.plugin", "cloud-aws", "2.1.2"