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https://issues.apache.org/jira/browse/KAFKA-7269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16576449#comment-16576449
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Matthias J. Sax commented on KAFKA-7269:
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I am not sure about "union" – union is a set operation, thus, it actually does 
not make sense mathematically, because "union" removes duplicates. (Even if 
most system don't enforce this mathematical property by default but required to 
specify a "distinct" keyword for this.)

> KStream.merge is not documented
> -------------------------------
>
>                 Key: KAFKA-7269
>                 URL: https://issues.apache.org/jira/browse/KAFKA-7269
>             Project: Kafka
>          Issue Type: Improvement
>          Components: documentation, streams
>    Affects Versions: 1.0.0, 1.0.1, 1.0.2, 1.1.0, 1.1.1, 2.0.0
>            Reporter: John Roesler
>            Priority: Major
>              Labels: beginner, newbie
>
> If I understand the operator correctly, it should be documented as a 
> stateless transformation at 
> https://kafka.apache.org/20/documentation/streams/developer-guide/dsl-api.html#stateless-transformations



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