At the Lucene level the index should be 100% compatible, but I don't know with 100% certainty whether there may be subtle changes in any field type analyzers or token filters, such as in the example schema. You might want to read SOLR-2519 and see whether your fields and field types may be impacted in a way that might be incompatible between the 3.6 index-time analyzers and your 3.4 field type analyzers. But if you stick with your own field types, you should be okay.

-- Jack Krupansky

-----Original Message----- From: Dominique Bejean
Sent: Monday, August 20, 2012 5:13 AM
To: solr-user@lucene.apache.org
Subject: Upgrade solr 3.4 to solr 3.6.1 without rebuilding the existing index ?

Hi,

I think the response is yes, but I need to check.

Is it possible to upgrade from solr 3.4 to solr 3.6.1 without rebuilding
the existing index ?

Thank you.

Dominique

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