I am running splunk server(indexer) 4.2.3 on a RHEL machine and appr. 200 universal forwarders(all running 4.2.3) are sending logs to this server. My question is, I want to upgrade my server(indexer) from 4.2.3 to 4.3. So after the indexer upgrade, does the universal forwarders need to be upgraded to 4.3? Please let me know about this. Thanks in Advance!!!