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Hi Robin,
the problem is that you used the DSL (the QueryBuilder), which is not a query parser. Also by using .keyword() you expressed the need of an ~exact match on the string.

To parse a string like "1 OR 2 OR 3" you should use the QueryParser.

Adapting from Example 4.21. Using the scoped analyzer when building a full-text query

 
org.apache.lucene.queryparser.classic.QueryParser parser = new QueryParser( "title", fullTextSession.getSearchFactory().getAnalyzer( Book.class ) );

org.apache.lucene.search.Query luceneQuery = parser.parse( "title:sky Or title_stemmed:diamond" );

org.hibernate.Query fullTextQuery = fullTextSession.createFullTextQuery( Book, Song.class );

List result = fullTextQuery.list(); //return a list of managed objects

HTH!

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