问Lucene 4.1忽略了FieldType.tokenized = false

EN

public class LuceneDemo {

  public static void main(String[] args) throws IOException {
    Directory lDir = new RAMDirectory();
    Analyzer analyzer = new KeywordAnalyzer();
    IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_41, analyzer);
    iwc.setOpenMode(OpenMode.CREATE);
    IndexWriter writer = new IndexWriter(lDir, iwc);

    // BTW, Lucene, anyway you could make this even more tedious???
    // ever heard of builders, Enums, or even old fashioned bits?
    FieldType keywordFieldType = new FieldType();
    keywordFieldType.setStored(true);
    keywordFieldType.setIndexed(true);
    keywordFieldType.setTokenized(false);

    Document doc = new Document();
    doc.add(new Field("$foo",  "$bar123", keywordFieldType));
    doc.add(new Field("contents",  "$foo=$bar123", keywordFieldType));
    doc.add(new Field("$foo2",  "$bar12345", keywordFieldType));

    Field onCreation = new Field("contents",  "$foo2=$bar12345", keywordFieldType);
    doc.add(onCreation);
    System.out.println("When creating, the field's tokenized is " + onCreation.fieldType().tokenized());
    writer.addDocument(doc);
    writer.close();

    IndexReader reader = DirectoryReader.open(lDir);
    Document d1 = reader.document(0);
    Field readBackField = (Field) d1.getFields().get(0);
    System.out.println("When read back the field's tokenized is " + readBackField.fieldType().tokenized());

    IndexSearcher searcher = new IndexSearcher(reader);

// exact match works
Term term = new Term("$foo", "$bar123" );
    Query query = new TermQuery(term);
    TopDocs results = searcher.search(query, 10);
    System.out.println("when searching for : " + query.toString() + "  hits = " + results.totalHits);

    // partial match fails
    term = new Term("$foo", "123" );
    query = new TermQuery(term);
    results = searcher.search(query, 10);
    System.out.println("when searching for : " + query.toString() + "  hits = " + results.totalHits);

    // wildcard search works
    term = new Term("contents", "*$bar12345" );
    query = new WildcardQuery(term);
    results = searcher.search(query, 10);
    System.out.println("when searching for : " + query.toString() + "  hits = " + results.totalHits);
    }
}

When creating, the field's tokenized is false
When read back the field's tokenized is true
when searching for : $foo:$bar123  hits = 1
when searching for : $foo:123  hits = 0
when searching for : contents:*$bar12345  hits = 1