I checked sessionId in document, here is `Guid`, but String request [in
code](https://github.com/apache/tinkerpop/blob/master/gremlin-server/src/main/java/org/apache/tinkerpop/gremlin/server/op/session/SessionOpProcessor.java#L210),
and it fails when `Guid` in args
```
[WARN] OpExecutorHandler - java.util.UUID cannot be cast to java.lang.String
java.lang.ClassCastException: java.util.UUID cannot be cast to java.lang.String
at
org.apache.tinkerpop.gremlin.server.op.session.SessionOpProcessor.getSession(SessionOpProcessor.java:203)
```
anyway, we should update document or add `UUID` support in `gremlin-server`
[ Full content available at: https://github.com/apache/tinkerpop/pull/1257 ]
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