Hi Need to upgrade from Solr 4.x directly to the new 6.0? Here is a script that does it automatically for all your cores: https://github.com/cominvent/solr-tools/blob/master/upgradeindex/upgradeindex.sh
USAGE: Script to Upgrade old indices from 4.x and 5.x to 6.x format, so it can be used with Solr 6.x or 7.x Usage: ./upgradeindex.sh [-s] <indexdata-root> Example: ./upgradeindex.sh /var/lib/solr Please run the tool only on a cold index (no Solr running) The script leaves a backup in <indexdata-root>/<core>/data/index_backup_<version>.tgz. Use -s to skip backup Requires wget or curl to download dependencies -- Jan Høydahl, search solution architect Cominvent AS - www.cominvent.com