Take a look at the solr/CHANGES.txt file. Each release has an "Upgrading from " section, the one you're interested in is "Upgrading from Solr 1.4" in the 3.1.0 section, and then the ones that are in subsequent sections.
Of course I'd try it on a copy of my index first... If at all possible, the easiest way is to re-index your data. Best Erick On Fri, Mar 9, 2012 at 4:10 AM, Abhishek tiwari <abhishek.tiwari....@gmail.com> wrote: > Can some help me how to Upgrade my solr from 1.4? what step we need to > take..
