Regarding MongoDB update "collation" errors

Graylog Central (peer support)
1

I was bitten by this problem when upgrading MongoDB. (There is a closed question from August asking about this).

I found the db.views.dropIndexes() and it failed at first. Turns out (I found out when making a MongoDB backup with mongodump) at least in my case there were two graylog databases.

graylog and graylog.10.

So, running MongoDB 5 I used mongosh to perform that db.views.dropIndexes() on each database. You need to connect to the server specifying the database as a parameter to mongosh.

That solved the problem for me.

2

@tuaris this might be your problem.

Do a mongodump, check whether you have several Graylog databases, and run db.views.dropIndexes() for each one of them.