We are considering to use Blast for a Project to replace Elastic Search.

But we need to support many languages and GRPC makes it much easier.
Also for the HTTP is gives the devs a swagger REST API.

Blast would be easier to use from different languages and the web if the API used GRPC and GRPC Gateway.

https://github.com/grpc-ecosystem/grpc-gateway

Easy example
https://github.com/johanbrandhorst/grpcweb-boilerplate