Map elasticsearch field to different field

Elastic Stack Elasticsearch
1

I am using two indexes.The first, called lessons1 has a userId field:

userId : < id number>

The second is called users1 and has a userName field:

userName: <user name>

and a userId field,

userId: <id number>

When running a query on lessons1, I would like to return the userName intead of the userId.
I have tried to do this by creating a combined index called *1 and do definitions in logstash, but have not succeeded. Could you please help me find a solution.

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