[Mailman-Users] Making a Mailman legacy archive searchable?

David Roth writes:

Is there anything open-source to make a Mailman legacy archive searchable?

FreeWAIS (oldie but still goodie), Namazu, and Xapian come to mind. They all require some effort on the part of the user, though. I don't know of anything that you can trivially install (eg, from RPM or .deb).