Lucene.net build query

private static Query BuildQuery(Analyzer analyzer, IEnumerable<string> searchFields, string searchQuery)
{
    var query = new BooleanQuery();

    var tokenStream = analyzer.TokenStream(null, new StringReader(searchQuery));
    var termAttribute = (TermAttribute)tokenStream.GetAttribute(typeof(TermAttribute));

    while (tokenStream.IncrementToken())
    {
        var term = termAttribute.Term();
        var booleanQuery = new BooleanQuery();

        foreach (var searchField in searchFields)
        {
            // TermQuery, PrefixQuery or FuzzyQuery
            booleanQuery.Add(new FuzzyQuery(new Term(searchField, term)), BooleanClause.Occur.SHOULD);
        }

        query.Add(booleanQuery, BooleanClause.Occur.MUST);
    }

    return query;
}