CreateApiKeyRequest.RoleDescriptor is missing some fields

[swallez]

Found in elastic/elasticsearch-java#106

security/create_api_key/types.ts/RoleDescriptor is missing some fields and should actually be replaced with security/get_service_accounts/types.ts/RoleDescritor (the docs -- and the code -- says they are the same structure).

Which probably means that RoleDescriptor should be moved to security/_types.

Also, the indices field needs an @aliases index (ES accepts both).

This is a breaking change as we move types around. It has to be backported to 7.17 (long term 7.x support), but probably not to 8.1.