'How to update all values except one in Realtime Database?

This is my node structure:
Database node
I want to change email, name and roll. For this, I have used map in java and used setvalue(map). But the problem is node extra is being deleted here. This node is used by cloud function, so I don't want to download the data and set the data while saving again.

Because:
Reason for not downloading
If the above step is completed before the below step, then I won't get the URL.
I don't want to touch the node extra and change other nodes at once. Is there any way to do so?

javaandroidfirebasefirebase-realtime-databasegoogle-cloud-platform


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