title: Lucene: unstored fields
body: <p><p>I just wondering whenever exist a way to read the unstored, but indexed field in Lucene index? I need because I have an index and I'm going to iterate over all documents in the index in order to apply some analysis and I need to update  those documents later, in order to update I need first delete and when to re-insert the document. The problem is that I don't know whenever it's possible at all to read the unstored fields in order to copy them as is into updated document.</p>