We run an old master/slave solr 4.3.0 solr cluster 14 nodes 7/7 indexes average 47/5 gig per shard around 2 mill docs per shard.
We have constant daily additions and a small amount of deletes. We optimize nightly currently and it is a system hog. Is it feasible to never run optimize? I ask because it seems like it would be very bad not to but this information is out there apparently recommending exactly that... never optimizing. https://lucidworks.com/2017/10/13/segment-merging-deleted-documents-optimize-may-bad/ https://lucidworks.com/2018/06/20/solr-and-optimizing-your-index-take-ii/ https://wiki.apache.org/solr/SolrPerformanceFactors#Optimization_Considerations
