Stop running integration tests for Elasticsearch v5/v6

[yurishkuro]

Which problem is this PR solving?

• Part of [Deprecation] Drop support for Elasticsearch v5 / v6 #5439

Description of the changes

• Stop running integration tests for Elasticsearch v5/v6

How was this change tested?

• CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.30%. Comparing base (7d32d36) to head (50bc4fd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5440      +/-   ##
==========================================
+ Coverage   95.29%   95.30%   +0.01%     
==========================================
  Files         334      334              
  Lines       16233    16233              
==========================================
+ Hits        15469    15471       +2     
+ Misses        583      582       -1     
+ Partials      181      180       -1     

Flag	Coverage Δ
badger_v1	7.97% <ø> (ø)
badger_v2	1.91% <ø> (ø)
cassandra-3.x-v1	16.27% <ø> (ø)
cassandra-3.x-v2	1.83% <ø> (ø)
cassandra-4.x-v1	16.27% <ø> (ø)
cassandra-4.x-v2	1.83% <ø> (ø)
elasticsearch-5.x	?
elasticsearch-6.x	?
elasticsearch-7.x	1.76% <ø> (ø)
elasticsearch-8.x	1.75% <ø> (-0.02%)	⬇️
grpc_v1	10.13% <ø> (ø)
grpc_v2	7.39% <ø> (?)
kafka	9.68% <ø> (ø)
opensearch-1.x	1.75% <ø> (-0.02%)	⬇️
opensearch-2.x	1.75% <ø> (ø)
unittests	93.51% <ø> (+0.01%)	⬆️

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[varshith257]

LGTM