Logz.io is "Built on ELK and Grafana". It is a hosted solution and an easy way to integrate your cluster with ELK without worrying about the ELK setup itself.
Crea a Logz.io account
It has free with a trial version: https://logz.io/pricing/
Follow the instructions and create your account.
Deploy Logz.io fluentd on your cluster
First of all, get you account token. Click on the gear icon on the top right corner, Setting, General and get your token.