Lucene 4.2 StringField

Question

I\'m new to Lucene. I have two documents and I would like to have an exact match for the document field called \"keyword\" (the field may occur multiple times within a documen

Answer 1

You problem is not in how you are indexing the field. The string field is the correct way to index the entire input as a single token. The problem is how you are searching. I really don't know what you are intending to accomplish with this logic, really.

BooleanQuery qry = new BooleanQuery();
qry.add(new TermQuery(new Term("keyword", "\"Annotation is cool\"")), BooleanClause.Occur.MUST);
//Great! You have a termQuery added to the parent BooleanQuery which should find your keyword just fine!

Query q = new QueryParser(Version.LUCENE_42, "title", analyzer).parse(qry.toString());
//Now all bets are off.

Query.toString() is a handy method of debugging, but it is not safe to assume that running the output text query through a QueryParser will regenerate the same query. The standard query parser really doesn't have much capability to express multiple words as a single term. The String version of this that you see will, I believe, look like:

keyword:"Annotation is cool"

Which will be interpreted as a PhraseQuery. A PhraseQuery will look for three consecutive terms, Annotation, is, and cool, But the way you have indexed this, you have a single term "Annotation is cool".

The solution is don't ever use logic like

 Query nuttyQuery = queryParser.parse(perfectlyGoodQuery.toString());
 searcher.search(nuttyQuery);

Instead, just search with the BooleanQuery you already created.

 searcher.search(perfectlyGoodQuery);