[FLINK-31228] Update kafka and zookeeper docker image #41
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As reported in FLINK-31228 and issue#734, the zookeeper image maintained by
wurstmeister
is buggy. And it is also not well documented.On the other hand, docker images from
bitnami
are updated frequently, and they are well documented. So I think we need to switch to bitnami.In addition, since both
elasticsearch
andkibana
are available on official Hub, there is no need to use docker.elastic.co.I have conducted all tests in my computer on updated code.