What Elasticsearch version is offered, and can I upgrade?

Through our dashboard, we currently offer stable releases of 1.5.2, 1.6.2, 1.7.5, 2.0.2, 2.1.1, 2.3.4, 2.4.4, 5.1.2, 5.2.2, 5.3.2 and 5.5.1. You can expect new major versions to be on the dashboard soon after release. If you need a version that isn't available on the dashboard, or need to upgrade your cluster, contact support and our engineers will be happy to assist: https://qbox.io/support