I have started using Heroku's addon for ElasticSearch, Bonsai. I want to create a backend search for several categories on my website. Since this is a backend only service, and may contain sensitive information, how do I limit the IP addresses connecting to the Bonsai server that Heroku has provided me to only the IP address/range of my web servers.
Note that my web servers are running on private hardware and are not hosted on a cloud service. I am also not using any other web service on Heroku, so I prefer not to use a Ruby answer to this.