Bump up default Elastic stack to v8.4

[mtojek]

This PR bumps up the default Elastic stack version to 8.4.1

[elasticmachine]

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• Start Time: 2022-09-09T07:32:21.496+0000

• Duration: 33 min 54 sec

Test stats 🧪

Test	Results
Failed	0
Passed	828
Skipped	0
Total	828

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (34/34)	💚
Files	66.929% (85/127)	👍
Classes	61.667% (111/180)	👍
Methods	48.834% (356/729)	👍
Lines	32.204% (3221/10002)	👍
Conditionals	100.0% (0/0)	💚