Cherry-pick #8853 to 6.x: Update docs and test files regarding Kafka 2.0 support in filebeat#8871

Merged

jsoriano merged 1 commit intoelastic:6.xfrom jsoriano:backport_8853_6.x

Nov 2, 2018

+206-2

Commits on Nov 1, 2018

Update docs and test files regarding Kafka 2.0 support in filebeat (elastic#8853 )
jsoriano
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