Cherry-pick #25074 to 7.x: [Filebeat][httpjson] Change append transform to initiate new fields as a slice#25088

Merged

P1llus merged 2 commits intoelastic:7.xfrom P1llus:backport_25074_7.x

Apr 16, 2021

+16-2

Commits on Apr 14, 2021

[Filebeat][httpjson] Change append transform to initiate new fields as a slice (elastic#25074 )
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Merge branch '7.x' into backport_25074_7.x
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