Thanks for the compliment. :-) The UI components would always remain open-source.

We offer a hosted search service at appbase.io which funds this and have very recently started offering it more broadly as a managed platform for any ElasticSearch upstream. It offers a better search development experience, out-of-the-box search/click analytics and more fine-grained security features: https://medium.appbase.io/appbase-io-clusters-a-supercharged....