How to fix the issue Master node not identified during the Elk upgrade from 6.8 to 7.13.2

Hello everyone, I need a help.
During the elastic migration from ELK 6.8 to 7.13.2
The problem that we are facing is that when the data is present cluster unique id is not present that's why it cannot connect.

I don't understand what you're meaning.
What's the problem?

And why migrating to an obsolete version and not 7.17?

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