It's the output.elasticsearch.index setting, but it's a bit more complex for modules because the dashboards and templates all assume a given index name. So you need to change all the settings mentioned here under Change the index name.
You can introduce these settings at the CLI with -E, if you prefer the CLI.
Thank you Tudor for the reply. I think that I could export dashboard in a file, then I set the parameter in filebeat.yml.
After I re-import dashboard modified (I open the file and set new index name in the dashboard and visualize too).
At the end I start the filebeat with the modifie parameter.
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