At some point down the line we might need to deprecate an endpoint and we want Compass folks to upgrade their Compass version. We can do this with an error code. When we receive the error code we can then surface an error in Compass letting folks know they should upgrade to the newest Compass version to use the feature.

Let's keep our error codes documented in https://docs.google.com/document/d/1VplQzRSdUOf0NU-guhorKC4WmJMsoyItcD16uaolGYA/edit#heading=h.2s9zdv6a57gn 
Not sure if the error message should be in Compass or something more generic Compass knows to show from the backend.