Please note that the 5.1 docs are hosted on a new site: maprdocs.mapr.com
This is both a new site and a new platform. We are no longer using Confluence for new documentation. You will notice some general changes, including a better built-in search mechanism. The latest interoperability matrix and ecosystem release notes are also available on the new site.
The 5.0 and earlier docs continue to live in Confluence in the same place: doc.mapr.com. The Confluence docs will eventually become obsolete, but we will continue to fix bugs there for 5.0 and 4.x.