Not exactly your case, but i stumbled upon the same problem. What i was able to identify was that the problem with different score is because it uses MaxDocs to calculate score and that one sometimes differ between replicas.
All the exactStats impl did not solve the problem for me, because they do solve the problem if the shards have different statistics but not if the replicas of the same shard have different ones. One easy way to solve the problem is to change Solr code and exactStats impl to ask statistics for all replicas from the shards involved (not only one for each shard) and the calculated score will always be equal, of course it has a lot of downsides. i did that, but the fact that the whole cluster would be queried for all searches in my case made it impractical. I created a script to repeatedly add a random number of docs while simultaneously deleting some, and after some iterations the MaxDoc got different between the replicas of the shards, even in a single instance. And then checked that none of those impls solved the problem. -- Sent from: https://lucene.472066.n3.nabble.com/Solr-User-f472068.html
