[v2] Add ES config comments

[yurishkuro]

Improve documentation

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.46%. Comparing base (acbc0e1) to head (07f8bce).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6110   +/-   ##
=======================================
  Coverage   96.46%   96.46%           
=======================================
  Files         352      352           
  Lines       19986    19986           
=======================================
  Hits        19280    19280           
  Misses        522      522           
  Partials      184      184           

Flag	Coverage Δ
badger_v1	8.42% <ø> (ø)
badger_v2	1.70% <ø> (ø)
cassandra-4.x-v1	14.57% <ø> (ø)
cassandra-4.x-v2	1.64% <ø> (ø)
cassandra-5.x-v1	14.57% <ø> (ø)
cassandra-5.x-v2	1.64% <ø> (ø)
elasticsearch-6.x-v1	18.73% <ø> (ø)
elasticsearch-7.x-v1	18.81% <ø> (+0.01%)	⬆️
elasticsearch-8.x-v1	18.97% <ø> (-0.02%)	⬇️
elasticsearch-8.x-v2	1.69% <ø> (-0.02%)	⬇️
grpc_v1	8.78% <ø> (+0.01%)	⬆️
grpc_v2	6.72% <ø> (+0.01%)	⬆️
kafka-v1	8.99% <ø> (ø)
kafka-v2	1.70% <ø> (ø)
memory_v2	1.70% <ø> (ø)
opensearch-1.x-v1	18.86% <ø> (+0.01%)	⬆️
opensearch-2.x-v1	18.85% <ø> (ø)
opensearch-2.x-v2	1.69% <ø> (ø)
tailsampling-processor	0.48% <ø> (ø)
unittests	95.38% <ø> (ø)

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