Lucene.Net would be a good choice, even if you had full-text search capability.
Lucene.Net extends the past by offering FTS (full sql text). Including promotion conditions, fuzzy queries, a simple aspect search, which can be found in the Contrib project in branch 2.9.4g, etc.
Its openource, so you do not need to wait on anyone else's loop to change it or extend or add functions.
There are a few posts and even FOSS contrib projects that will help get around a higher barrier to entry. I would recommend the content in the list below, starting with Lucene in action.
The book is a great resource, but the latest version is for Lucene 3.0, the java version that includes new APIs that didn't make it into the .NET version.
Lucene.Net will also pay off as a decent library to add skillset skills to your overall repertoire. Search is pretty much different than most apps these days.
The Lucene.Net project has returned to incubation with a newer set of committers and goals. One of these goals is to make it easier and more understandable for .NET. However, he will definitely take time and cycles to achieve this.
At the same time, you can always ask for help on the mailing list or using the irc channel # lucene.net.
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