Github user dawidwys commented on the issue:
https://github.com/apache/flink/pull/6259
Actually I've suggested to move the whole writing schema logic into the
coder. So the coder should have a method like `writeSchema(..., OutputStream
out)`.
Substituting previous `topic + "value"` with `subject` does not change
anything. It simply renames a lookup key. The whole problem is that it is
static and does not take into account the actual topic the message will be
written to. Unfortunately I am afraid it would require some changes in the
`FlinkKafkaProducer` itself.
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