AFAIK Solr 4 should be able to read Solr 3.6 indexes. Soon those files will be updated to 4.0 format and will not be readable by Solr 3.6 anymore. See http://wiki.apache.org/lucene-java/BackwardsCompatibility You should not use a a 3.6 SolrJ client with Solr 4 server.
Tomás On Wed, Jan 2, 2013 at 3:04 PM, Benjamin, Roy <rbenja...@ebay.com> wrote: > Will the existing 3.6 indexes work with 4.0 binary ? > > Will 3.6 solrJ clients work with 4.0 servers ? > > > Thanks > Roy >
