You have to have indexed something that uniquely identifies the document in order to know what the old one is. Really, this is the same question as updating, isn't it? If you could update a document in place, you'd have to know what document that was. If you know that information, you know which document to delete.
Note that lucene has no built-in document recognition. If I add the same document to the index twice, Lucene will happily consider them two *separate* documents. You have to code your own notion of document meta-id (as distinct from the Lucene doc id). It could be the URL, the file path on disk, a document ID from your organization... the possibilities are endless. Which is why Lucene can't do that for you. Best Erick On Mon, Nov 10, 2008 at 2:22 PM, ChadDavis <[EMAIL PROTECTED]>wrote: > In the FAQ's it says that you have to do a manual incremental update: > > How do I update a document or a set of documents that are already indexed? > > > > There is no direct update procedure in Lucene. To update an index > > incrementally you must first *delete* the documents that were updated, > and > > *then re-add* them to the index. > > > > How do I determine the existing document that matches the document I am > updating? >
