This is actually due to a bug:
https://issues.apache.org/jira/browse/LUCENE-3065
which was ixed in 3.2. The bug is that, prior to Lucene 3.2, if you
stored a NumericField, when you later load that document, the field is
converted to an ordinary Field (no longer numeric), so when you then
index that retrieved document you lost its numeric-ness.
That said, retrieving a doc and reindexing it is dangerous because in
general Lucene does not ensure all details are preserved. For
example, boost is never returned correctly, whether a field was
indexed, and whether term vectors were indexed, are all not preserved.
So in general you shouldn't assume you can just load a document,
modify it a bit, re-index it, and not lose something...
Mike McCandless
http://blog.mikemccandless.com
On Wed, May 9, 2012 at 1:33 PM, Tim Eck <[email protected]> wrote:
> Note: I'm bound to lucene 3.0.3 for the context of this question, but
> I would be interested to know if newer versions would help me here.
>
> I have an existing document in my directory that has one regular
> String field and one numeric field. I naively thought I could update
> that document to change the String field with code like this:
>
> FSDirectory dir = FSDirectory.open(...);
> IndexWriter writer = new IndexWriter(dir, new
> StandardAnalyzer(Version.LUCENE_30), MaxFieldLength.UNLIMITED);
>
> // doc has 2 fields, one String and the other numeric
> Document doc = new Document();
> doc.add(new Field("string", "value", Store.YES,
> Index.ANALYZED_NO_NORMS));
> NumericField nf = new NumericField("numeric", Field.Store.YES,
> true);
> nf.setIntValue(42);
> doc.add(nf);
> writer.addDocument(doc);
> writer.commit();
>
> // make sure we can query on the numeric field
> IndexSearcher searcher = new IndexSearcher(dir);
> TopDocs docs = searcher.search(new TermQuery(new Term("numeric",
> NumericUtils.intToPrefixCoded(42))), 1);
> if (docs.totalHits != 1) {
> throw new AssertionError();
> }
> doc = searcher.doc(docs.scoreDocs[0].doc);
> searcher.close();
>
> // update document with new value for string field
> doc.removeField("string");
> doc.add(new Field("string", "value2", Store.YES,
> Index.ANALYZED_NO_NORMS));
> writer.updateDocument(new Term("string", "value"), doc);
> writer.commit();
>
> // search again
> searcher = new IndexSearcher(dir);
> docs = searcher.search(new TermQuery(new Term("numeric",
> NumericUtils.intToPrefixCoded(42))), 1);
> if (docs.totalHits != 1) {
> throw new AssertionError(docs.totalHits);
> }
>
>
> That doesn't seem to work however. It seems I need to get the
> NumericField rematerialized in the document passed to
> updateDocument(). I was hoping to avoid that if possible so
> I'm looking for any suggestions someone might offer.
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