update transforms to be unattended

[joeypoon]

Change Summary

Update current + united metadata transforms to be settings.unattended: true.

Related: https://github.com/elastic/security-team/issues/6165

Release Target

8.8

For Transform changes:

• The new transform successfully starts in Kibana

[elasticmachine]

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• Start Time: 2023-03-08T14:57:29.886+0000

• Duration: 8 min 6 sec

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[pzl]

Does fleet respect this settings key? Is the transform installed with this setting?

[joeypoon]

Does fleet respect this settings key? Is the transform installed with this setting?

yes and yes. fleet passes the entire transform body to ES without any validation so don't need to add anything there. this won't change the transform functionally. this just tells ES to manage the transform's health and to always retry if in failing state: https://www.elastic.co/guide/en/elasticsearch/reference/current/put-transform.html (sorry no anchors on page, have to search for unattended).

[pzl]

looks good.

I bet the linters are complaining about the final newline in the file. Should pass if you remove it