Run tests also on elasticsearch 8

[fizyk]

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.13% :tada:

Comparison is base (f88b784) 96.24% compared to head (14ccf43) 96.37%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #384      +/-   ##
==========================================
+ Coverage   96.24%   96.37%   +0.13%     
==========================================
  Files           4        4              
  Lines         133      138       +5     
==========================================
+ Hits          128      133       +5     
  Misses          5        5              

Flag	Coverage Δ
elastic-7.14	96.37% <100.00%> (+0.13%)	:arrow_up:
elastic-7.15	?
elastic-7.16	96.37% <100.00%> (+0.13%)	:arrow_up:
elastic-7.17	96.37% <100.00%> (+0.13%)	:arrow_up:
elastic-8.0	96.37% <100.00%> (?)
linux	96.37% <100.00%> (+0.13%)	:arrow_up:

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Files Changed	Coverage Δ
pytest_elasticsearch/executor.py	91.30% <100.00%> (+0.82%)	:arrow_up:
pytest_elasticsearch/factories.py	98.41% <100.00%> (+0.02%)	:arrow_up:

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