Github user spmallette commented on the issue:
https://github.com/apache/tinkerpop/pull/548
I'm pretty sure @okram was affirming that `VertexStep`, `EdgeVertexStep`
and `PropertiesStep` should implement `AutoCloseable` (I don't think that there
are others) rather than a blanket change of just applying it to `FlatMapStep`.
As the logic is re-used, perhaps you could do an `ElementStep` that extends the
`FlatMapStep` and implements `AutoCloseable`. Then have those three steps
extend `ElementStep` which would contain the close logic that you have.
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