Github user tzulitai commented on the issue: https://github.com/apache/flink/pull/4473 @bowenli86 the third option actually strikes me as an overall good solution, I didn't know that was possible. I think it would make sense to deprecate the previous configuration keys in favor of the `fromProperties` solution. Ideally, it would be better if we can simply let the user freely configure the internal Kinesis client depending on whatever keys are available from AWS. It also shouldn't be too much of a hassle to adapt the deprecated keys such that if the user still used them, we simply replace them with the new renamed keys, and in open() always use `KinesisProducerConfiguration#fromProperties(Properties props)`. What do you think?
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