Why is the old value still in the index

[Paul Taylor]

I'm adding documents to an index, at a later date I modify a document 
and update the index, close the writer and open a new IndexReader. My 
indexreader iterates over terms for that field and docFreq() returns one 
as I would expect, however the iterator  returns both the old value of 
the document and the new value, I don't expect (or want) the old value 
to still be in the index, so why is this.

This full test program generates:

TermDocsFreq1
test
TermDocsFreq1
test
test2

Dont expect to see 'test' listed the second time


package com.jthink.jaikoz;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.*;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;


public class LuceneTest
{
    public  static void main(String []args)
    {
        try
        {
            String FIELD1="field1";
            RAMDirectory dir = new RAMDirectory();
            IndexWriterConfig iwc = new 
IndexWriterConfig(Version.LUCENE_35, new 
StandardAnalyzer(Version.LUCENE_35));
            IndexWriter       iw  = new IndexWriter(dir, iwc);
            Document document = new Document();
            document.add(new Field(FIELD1,"test", Field.Store.YES, 
Field.Index.ANALYZED));
            iw.addDocument(document);
            iw.close();

            IndexReader ir = IndexReader.open(dir,true);
            TermEnum terms = ir.terms(new Term(FIELD1));
            System.out.println("TermDocsFreq"+terms.docFreq());
            do
            {
                if (terms.term() != null)
                {
                    System.out.println(terms.term().text());
                }
            }
            while (terms.next() && terms.term().field().equals(FIELD1));

            IndexWriterConfig iwc2 = new 
IndexWriterConfig(Version.LUCENE_35, new 
StandardAnalyzer(Version.LUCENE_35));
            iw  = new IndexWriter(dir, iwc2);
            document = new Document();
            document.add(new Field(FIELD1,"test2", Field.Store.YES, 
Field.Index.ANALYZED));
            iw.updateDocument(new Term(FIELD1,"term1"),document);
            iw.close();

            ir = IndexReader.open(dir,true);
            terms = ir.terms(new Term(FIELD1));
            System.out.println("TermDocsFreq"+terms.docFreq());
            do
            {
                if (terms.term() != null)
                {
                    System.out.println(terms.term().text());
                }
            }
            while (terms.next() && terms.term().field().equals(FIELD1));
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
    }

}


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