[Mailman-Users] Search tool for Mailman Archives

[Liste Yoneticisi]

Hello;

I am trying to implement a search tool for Mailman Archives.

In our system, there are more than 400 lists, and the size of their 
archives vary, since there are more than 10 years old lists addition to 
new lists.

There are several alternatives.
htdig, xapian etc.

Which one do you recommend?

Is there a practical tool which I can just install and implement, or is 
there an additional patch need?

Thank you very much.
Evrim AKMAN