The documentation for the Jena Text search feature is at:
The documentation says:
"This module was first released with Jena 2.10.2"
After hunting around I realised that there isn't a newer version of Jena that 2.10.1. To use this feature I ended up having to grab a 1.0.0-SNAPSHOT of Fuseki which appears to have the necessary classes.
Either the documentation is wrong, or the release pages need updating.
(I'm forever getting lost between the various dist directories, download pages and maven builds, etc).