THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Remark to 3: We add a new JSON `Map<String, String>` property to ExecNode to keep track of the node configuration.
Remark to 7: We use ExecNode name and version instead of class names.
Remark to 8 & 9: We will not change the JSON plan format across patch releases. Since every JSON plan is versioned by the compiling Flink version, external tooling can be build around it but without any guarantees from the Flink community across Flink minor/major versions yet. This is future work and can be offered once the plan design has settled.
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