Github user achristianson commented on the issue:
https://github.com/apache/nifi/pull/1372
@jdye64 Interesting, wasn't aware of the restrictions with the official
docker hub. When I go look at some other projects for comparison, it looks
roughly like the directory is used for compatibility releases. E.g. with
postgres you have 9.5, 9.6 directories, but each minor release maps to several
tags. The java image seems to break down the directories per major release (6,
7), and JDK vs JRE. Looking at centos, there is no directory:
https://github.com/docker-library/official-images/blob/master/library/centos.
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