Is there any chance create master SOLR4 replication to SOLR5 slave, and after replication change slave SOLR5 to master? Or what is the best way to migrate from SOLR 4 to SOLR 5 with convertation all indexes?
2 Answers
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Unfortunately I don't think such feature exists (at least I'm not aware about that). A master with version X doesn't know at all the format of a later version X+Y.
Even after reading some documentation the only thing I find is this [1], but as you can read, there's nothing that helps you.
So, while I think you have to re-index your corpus (with Solr 5), in the meantime you could try to
- index data in Solr 4 (Master)
- replicate those data in Solr 5 (Slave) with a LUCENE_VERSION 4.x set in solrconfig.xml
I never tried that, but [1] says Solr 5 doesn't have retro-compatibility with 3.x, so 4.x, which is your case, should be OK. The drawback here, is that your index (on Solr 5) will be still in 4.x format.
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