Most likely at least one of your indices is set with 1 replica per primary shard. Which can not be allocated on a single node cluster.
Either increase the number of nodes or set replicas to 0.
BTW did you look at https://www.elastic.co/cloud and https://aws.amazon.com/marketplace/pp/B01N6YCISK ?
Cloud by elastic is one way to have access to all features, all managed by us. Think about what is there yet like Security, Monitoring, Reporting, SQL, Canvas, APM, Logs UI, Infra UI and what is coming next 
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