Without using the Search.createFullTextSession is the right way to do it, regardless of your problem.
What is strange is that it seems FullTextSession.createFullTextQuery() expect to return o.h.Query where it should really return org.hibernate.search.FullTextQuery.
Which version of Seam are you using? The latest 2.0 release?
Can you give a try with the Hibernate Search version that is bundled with the Seam distribution.
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