Thanks Otis, but this is not my case. Most of my fields are not stored
, but I do have the original data in case I need to reindex.
My question is do I need to?
If my 1.4.1 can be read by 3.1, I assume 3.1 can continue to write to it?
In that case, I continue assuming that 4.0 will know how to read only
the new segments, and if I optimize it, than I will have only one new
segment, created by 3.1, thus readable by 4.0.
It makes sense to me, the only question is if my guesses are right:-)
Thanks.

On Friday, April 22, 2011, Otis Gospodnetic <otis_gospodne...@yahoo.com> wrote:
> Hi Ofer,
>
> We recently helped a customer go through just such an upgrade (or maybe even
> from 1.3.*).  We used a tool that read data from one index and indexed it to 
> the
> new index without having to reindex the data from the original sources.  All
> fields in the source index were obviously stored. :)
>
> Otis
> ----
> Sematext :: http://sematext.com/ :: Solr - Lucene - Nutch
> Lucene ecosystem search :: http://search-lucene.com/
>
>
>
> ----- Original Message ----
>> From: Ofer Fort <o...@tra.cx>
>> To: "solr-user@lucene.apache.org" <solr-user@lucene.apache.org>
>> Sent: Fri, April 22, 2011 10:34:26 AM
>> Subject: Re: Index upgrade from 1.4.1 to 3.1 and 4.0
>>
>> Nobody?
>> Am I the only one in need of upgrading an index that was created with  1.4.1?
>>
>> Thanks for any info
>> Ofer
>>
>> On Friday, April 22, 2011, Ofer  Fort <o...@tra.cx> wrote:
>> > Hi all,
>> >  While doing some tests, I realized that an index that was created with
>> >  solr 1.4.1 is readable by solr 3.1, but nt readable by solr 4.0.
>> > If I  plan to migrate my index to 4.0, and I prefer not to reindex it
>> > all,  what would be my best course of action?
>> > Will it be possible to continue  to write to the index with 3.1? Will
>> > that make it readable from 4.0 or  only the newly created segments?
>> > If I optimize it using 3.1, will that  make it readable also from 4.0?
>> > Thanks
>> > Ofer
>> >
>>
>

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