Update dependency elasticsearch to v15.4.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
elasticsearch	dependencies	minor	15.3.1 -> 15.4.1	homepage, source

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Release Notes

elastic/elasticsearch-js

v15.4.1

Compare Source

• Drop support for old versions in the 5.x line, only 5.6 is maintained

v15.4.0

Compare Source

• apiVersion "6.6" is now the default

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[coveralls]

Pull Request Test Coverage Report for Build 194

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 49.324%

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Totals
Change from base Build 190:	0.0%
Covered Lines:	59
Relevant Lines:	106

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💛 - Coveralls