Re: Authentication All the Schema's
No, this is not possible. TinkerPop/JanusGraph currently only support authentication to the graph system as a whole and do not support authorization. Later this year, the Apache TinkerPop 3.5.0 release will offer authorization, though, which will then also become available through a future JanusGraph release.
Until then, you will have to use separate Gremlin Server instances.
Best wishes, Marc