Query to find documents whihc contain the same value for a field, i.e duplicate fields

[Paul Taylor]

So I had this code, that would return all documents where there was more 
than one document that had the same value for fieldname. Trouble is I 
didn't realise this could return documents
that had been deleted, so Im wondering what an equivalent using queries 
would be.

public List<Integer> getDuplicates(int columnModelId)
{
       String fieldname = String.valueOf(columnModelId);
       List<Integer> matches = new ArrayList<Integer>();
        if (AudioDataModel.getInstance().getRowCount() == 0)
        {
            return matches;
        }

        IndexReader ir;

        try
        {
            ir = getIndexReader();
            TermEnum terms = ir.terms(new Term(fieldName, ""));
            do
            {
                if (terms.term() != null)
                {
                    if (terms.docFreq() > 1)
                    {
                        TermDocs termDocs = ir.termDocs(terms.term());
                        while (termDocs.next())
                        {
                            Document d = ir.document(termDocs.doc());
                            matches.add(new 
Integer(d.getFieldable(ROW_NUMBER).stringValue()));
                        }
                    }
                }
            }
            while (terms.next() && terms.term().field().equals(fieldName));
        }
        catch (IOException ioe)
        {
            MainWindow.logger.log(Level.WARNING, "DataIndexer.Problem 
searching for duplicates:" + ioe.getMessage(), ioe);
        }
        return matches;

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