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From Riccardo Tasso <>
Subject Re: IntField to IntPoint
Date Fri, 07 Jun 2019 08:40:18 GMT
Thanks Erik for your answer.

Unfortunately I should migrate the index for time reasons. Maybe in a
second moment we will have the opportunity to reindex.

Our use case is to classify documents in the index with lucene queries,
hence we're not really interested in ranking or sorting (which could be
relevant for the "norms case"). Do you think that migrating and reindexing
only the numeric fields could compromise the results returned by any query
(term, boolean, range, phrase, prefix)?

Il giorno mer 5 giu 2019 alle ore 17:41 Erick Erickson <> ha scritto:

> You cannot upgrade more than one major version, you must re-index from
> scratch. There’s a long discussion of why, but basically it’s summed up by
> this quote from Robert Muir:
> “I think the key issue here is Lucene is an index not a database. Because
> it is a lossy index and does not retain all of the user's data, its not
> possible to safely migrate some things automagically. In the norms case
> IndexWriter needs to re-analyze the text ("re-index") and compute stats to
> get back the value, so it can be re-encoded. The function is y = f(x) and
> if x is not available its not possible, so lucene can't do it.”
> This has always been true, before 8x it would just  fail silently as  you
> have found. Solr/Lucene starts up but don’t  work quite as expected. As of
> Lucene 8x, Lucene (and therefore Solr) will not even open an index that
> has  _ever_ been touched by Lucene 6x, no matter what intervening steps
> have been taken. Or in general,  Lucene/Solr X will  not  open indexes
> touched by X-2, starting with 8x rather than behave unexpectedly.
> Best,
> Erick
> > On Jun 5, 2019, at 8:27 AM, Riccardo Tasso <>
> wrote:
> >
> > Hello everybody,
> > I have a (very big) lucene 4 index with documents using IntField. On that
> > field, which should be stored and sortable, I should search and execute
> > range queries.
> >
> > I've tried to upgrade it from 4 to 7 with IndexUpgrader but I observed
> that
> > IntFields aren't searchable anymore.
> >
> > Which is the most efficient way to convert IntFields to IntPoints, which
> > are stored and sortable?
> >
> > Thanks,
> > Riccardo
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