Hello,
Correct me if I’m wrong, Are you migrating Indices and MongoDb database to a newer version of graylog? If so, there are a few examples here
If not, you should be able to use the package handler on your OS here
I upgrade my Graylog server 4.2 to 4.3 as followed.
root # yum update
Execute a restart for GL service. Be aware, there have been changes in 4.3.
Might want to check out this before upgrading.