We haven't tried yet.
But related to this, I have seen there is a new version of OpenFTS, 0.3.5, from a week ago, but in the original Perl version.
The new TSearch2 and the new OpenFTS 0.3.5 looks very promising.
1. There are plans to make a tcl version soon?.
We are playing with htdig, swish-e and swish++ and frankly they left many space to improve.
2. Someone has playing with OpenFTS 0.3.5 and TSearch2 to replace the classical search engines?
/Jorge