I migrated my Elastic & kibana versions from 7.9 to 7.17 to 8.6.2.
I continued to use same dashboards and data.
But in new ES version, I'm getting below issue for _id field.
I noticed that in old version, _id was mapped as string , but in latest version it is mapped as "_id". In old version, I was able to aggregate on _id field.
Any solution for this because I want to use & aggregate with _id field.