You need to
- Either download that file from your OP(google): the JWKS is referenced in https://accounts.google.com/.well-known/openid-configuration and is https://www.googleapis.com/oauth2/v3/certs . So download and save this locally before you start elasticsearch
- Or point elasticsearch to the url
op.jwkset_path: https://www.googleapis.com/oauth2/v3/certs
and we will handle fetching it for you.