chore: Made elastic versioned tests work on Node 16

[jsumners-nr]

@elastic/elasticsearch 8.14.0 no longer works on Node 16 https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/8.14/changelog-client.html

The cause is elastic/elasticsearch-js#2277.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.27%. Comparing base (7e3cab9) to head (62bc38d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2284      +/-   ##
==========================================
- Coverage   96.27%   96.27%   -0.01%     
==========================================
  Files         284      284              
  Lines       45230    45230              
==========================================
- Hits        43544    43543       -1     
- Misses       1686     1687       +1     

Flag	Coverage Δ
unit-tests-16.x	89.18% <ø> (ø)
unit-tests-18.x	89.16% <ø> (ø)
unit-tests-20.x	89.16% <ø> (ø)
versioned-tests-16.x	77.55% <ø> (-0.10%)	⬇️
versioned-tests-18.x	78.56% <ø> (-0.10%)	⬇️
versioned-tests-20.x	78.59% <ø> (-0.08%)	⬇️

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