Lucene - Exact string matching

Question

I'm trying to create a Lucene 4.10 index. I just want to save in the index the exact strings that I put into the document, witout tokenization.

I'm using the StandardAnalyzer.

    Directory dir = FSDirectory.open(new File("myDire"));
    Analyzer analyzer = new StandardAnalyzer();
    IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_4_10_0, analyzer);
    iwc.setOpenMode(OpenMode.CREATE);
    IndexWriter writer = new IndexWriter(dir, iwc);
    StringField field1 = new StringField("1", content1, Store.YES);
    StringField field2 = new StringField("2", content2, Store.YES);
    StringField field3 = new StringField("3", content3, Store.YES);
    doc.add(field1);
    doc.add(field2);
    doc.add(field3);
    writer.addDocument(doc, analyzer);
    writer.close();

If I print the index's content, I can see my data being stored, for example, my document has this "field 3":

    stored,indexed,tokenized,omitNorms,indexOptions=DOCS_ONLY<3:"Fuel Tank Capacity"@en>

I'm trying to query the index in order to get it back:

    IndexSearcher searcher = new IndexSearcher(reader);
    Analyzer analyzer = new StandardAnalyzer();
    QueryParser parser = new QueryParser("3", analyzer);
    String queryString = "\"\"Fuel Tank Capacity"\@en\"";
    Query query = parser.createPhraseQuery("3", QueryParser.escape(queryString));
    TopDocs docs = searcher.search(query, null, 20);

I'm trying to search the term "Fuel Tank Capacity"@en (quotation marks included) so I tried to escape them and I put another couple of quotes around the terms in order to let lucene understand that I'm searching for the entire texts.

If I print the query, I get: 3:"fuel tank capacity en" but I dont want to split the text on the @ symbol.

I think that my first problem is the StandardAnalyzer, because it seems to tokenize, if I'm not mistaken. However, I cannot understand how to query the index in order to get exactly "Fuel Tank Capacity"@en (quotation marks included).

Thank you

Answer 1

You could simplify matters, and just cut the QueryParser out of the equation entirely. Since you are using a StringField, the whole content of the field is a single term, so a simple TermQuery should work well:

Query query = new TermQuery(new Term("3","\"Fuel Tank Capacity\"@en"));