When you use .reopen() from an existing reader, the new reader will
share sub-readers with the prior one, and the FieldCache will also
share cache entries for those sub readers, with the prior one.
Still, remember that the incrementality you'll see is in proportion to
the size of the new segments.
I'm looking for some clarification on the use of field cache in a real time
index situation.
We are using Lucene in a real time fashion, but we update our reader via
IndexReader.reopen() rather than using the IndexWriter.getReader(); After
opening a new reader the old reader is closed.
In the
