Mapping move from 6.5 to 7.5

Hello. I need to move mapping from 6.5 to 7.5. In elastic I have field message with json format data.
Something like this
{"@timestamp": "2020-02-06T08:41:15.238Z", "comarch_request": {"method": "GET", "path": "/b2c/resources/balanceinfo", "body": null, "headers": {"Content-Type": "application/json", "elastic-apm-traceparent": "00-9e9e198cc34e463e6585c64ba6780619-23064c428acfd9fa-01", "Authorization": "bla-bla"}}
I need libk fileds like comarch_request.method: GET and ect.

Here my elastic mapping

And? What is the question?

how split mapping?

I'm sorry but I don't understand the question. Do you have an example of what you would like to see and in which context or what is the use case ?

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