Ensure ecs.version is always written

[Mpdreamz]

This brings our logs up to date with the latest version of the specification.

Blocked on elastic/ecs-logging#71

To ensure ecs.version is treated as a top level field in the shared specification

[apmmachine]

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• Start Time: 2023-01-23T09:28:01.297+0000

• Duration: 18 min 46 sec

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Test	Results
Failed	0
Passed	204
Skipped	2
Total	206

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[Mpdreamz]

/test

[Mpdreamz]

/test