One example link is: https://calcite.apache.org/docs/avatica_overview.html
This now redirects to: http://localhost:4000/avatica/docs/index.html
jekyll-redirect-from 0.12 introduced a breaking change for relative redirects: https://github.com/jekyll/jekyll-redirect-from/issues/149
This change was introduced to Calcite as part of commit: https://github.com/apache/calcite/commit/962c0a585f29fdb8717fc84395d218ffa15d8cba
Either the redirect needs to change to a absolute URL or remove the redirect altogether.