Ancient Hadoop docs are shown as top search results

[Wei-Chiu Chuang <we...@apache.org>]

When I search HDFS, the top result is this one from release version 1.2.1.
https://hadoop.apache.org/docs/r1.2.1/hdfs_design.html

I'm not sure what happened exactly, but it looks like old docs were
recreated/updated in January 2026: https://hadoop.apache.org/docs/

It would be useful for users and AI agents if we could tell Google to
prefer the more recent docs. I'm also fine with moving the doc pages to an
archival location.

Thanks,
Weichiu