Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/4175
Why do we have both `flink-docs-master` and `flink-docs-release-1.4`? The
main page only links to 1.3 and 1.4 but the flink-docs-master documentation
links to 1.3, 1.2, 1.1, and 1.0. But each of those packages only links to older
releases so if a user arrives on a 1.2 page they won't see 1.3.
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