Use ES7 index mapping files for ES8 and higher too

[Tornhoof]

Signed-off-by: Stefan Seft tornhoof+github@gmail.com

Which problem is this PR solving?

• Resolves Elasticsearch 8.x support #3571

Short description of the changes

• Modifies the index mapping to use the ES 7 mappings for higher versions too.
• Modifies the tests to include ES 8
• Modifies the github ci pipeline to add ES 8.1.0

[Tornhoof]

ah the docker command to run ES 8.1 is changed apparently the old arg --env xpack.monitoring.enabled=false is now called --env xpack.monitoring.templates.enabled=false. Need to fix that.

[codecov]

Codecov Report

Merging #3572 (d2e88bf) into main (4ec4cb7) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #3572      +/-   ##
==========================================
+ Coverage   96.48%   96.51%   +0.03%     
==========================================
  Files         264      264              
  Lines       15429    15429              
==========================================
+ Hits        14887    14892       +5     
+ Misses        458      454       -4     
+ Partials       84       83       -1     

Impacted Files	Coverage Δ
plugin/storage/es/mappings/mapping.go	100.00% <100.00%> (ø)
cmd/query/app/static_handler.go	97.60% <0.00%> (+1.79%)	⬆️
pkg/config/tlscfg/cert_watcher.go	94.73% <0.00%> (+2.10%)	⬆️

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[Tornhoof]

Okay I give up, the assumption that changing the mapping for 8 to use the 7.x mapping is apparently not enough or my non-existing go knowledge is not enough to figure out the error. I'm sorry.