Joseph B. Ottinger wrote:

Is there a way, after IndexWriter.addDocument(), to determine what the document's resulting id is? addDocument() has no return type; I could run a search, but the search might not be accurate if the document added is only slightly different than another document.

Would an external id be necessary?

As far as I know - yes.
Especially since the lucene document id can change i.e. if you delete a document and optimize the index.


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Mario


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