Github user rmetzger commented on the pull request:
https://github.com/apache/flink/pull/2042#issuecomment-222248940
Okay, let me explain:
I decided to remove the field, even though its public, and strictly
speaking a breaking API change. However, it was a mistake to mark the field as
public (back then, when it was added). It was only used internally as a
configuration key for storing the serialized execution config (so it was
something only used by flink).
It doesn't have any use for our users at all, so I think its absolutely
safe to remove it. Its also not mentioned in the documentation.
I've added this exclude to the API check to ignore the breaking change:
https://github.com/apache/flink/commit/b0acd97935cd21843bac3b9b5afa3662b52bb95d#diff-40616c4678c3fbfe07c0701505ce0567
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