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From Doron Cohen <>
Subject RE: Is Lucene Java trunk still stable for production code?
Date Thu, 15 Mar 2007 17:10:38 GMT
> An index created with a formal version (major or minor), would be
> (and hence upgradable) by a later version.

In fact this is not guaranteed for every "later version" - only for those
up to one major step ahead. The Wiki's statement is very accurate here:

   File formats are back-compatible between major versions.  Version X.N
   should be able to read indexes generated by any version after and
   including version X-1.0, but may-or-may-not be able to read indexes
   generated by version X-2.N.

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