Recently we have upgraded from 6.5 to 7.1 after this we are facing an issue in which we are getting different score of same document for same query. We study it and in some discussion there was solution of forcemerge and we have applied it after this no dynamic result. This was fine for 1 week but again we are facing same problem. What is the possible reason behind it and how we can fix it permanently.
We have one shard and one replica.