We are looking to upgrade our entire environment from 6.6.0 to 6.6.3, a software bug keeps causing the Indexers to crash so we have lost an entire site for the past few days. When it comes to upgrading the docs state to wait for the sites replication and search factor to be met, as the indexers have been down for a few days this may take some time. So is it advised to wait for this to happen before upgrading the next site i.e waiting 24 hours before starting to upgrade the second site? Will having each site on different versions cause any issues, or having one site on a different version to the Cluster Master or Search Heads? ... View more