IndexWriter should throw IndexFormatTooOldExc on open, not later during
optimize/getReader/close
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Key: LUCENE-2720
URL: https://issues.apache.org/jira/browse/LUCENE-2720
Project: Lucene - Java
Issue Type: Bug
Components: Index
Reporter: Michael McCandless
Fix For: 3.1, 4.0
Spinoff of LUCENE-2618 and also related to the original issue LUCENE-2523...
If you open IW on a too-old index, you don't find out until much later that the
index is too old.
This is because IW does not go and open segment readers on all segments. It
only does so when it's time to apply deletes, do merges, open an NRT reader,
etc.
This is a serious bug because you can in fact succeed in committing with the
new major version of Lucene against your too-old index, which is catastrophic
because suddenly the old Lucene version will no longer open the index, and so
your index becomes unusable.
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