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[BEAM-2257] Fixes bug with Kafka Producer needing a key serializer set in the case of value only PCollection #3969
…auto add the VoidSerializer for the key.serializer config for kafka producer
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@rangadi It looks like the move to the StringSerializer messed up the generics casting. Which was something I forgot I battled to get the VoidSerializer to work. I might have another approach that would keep the StringSerializer but remove the need for the casting.