Problem with full text search and bind variable

Hi.

I'm trying full text search with query:

SELECT s.*  
FROM [service:Service] as s  
WHERE contains(s.*, $text)  

bind $text variable with 'wow' value, execute query and result is empty. Repository contains document with property 'wow'.

when executing query lucene query looks like:
+(::wks:system ::wks:default) +::fts:"text" +jcr:primaryType:service:Service
but proper query is:
+(::wks:system ::wks:default) +::fts:"wow" +jcr:primaryType:service:Service

probably problem is here:
PlanUtil.java

here is new FullTextSearch object, but without field StaticOperand expression
and when call getFullTextSearchExpression FullTextSearch.java expression replaced by Literal (proper expression is BindVariableName).