[chore][docs] Add documentation to ElasticSearch configuration

[mahadzaryab1]

Which problem is this PR solving?

• Part of [jaeger-v2] Refactor ElasticSearch/OpenSearch Storage Configurations To Align With OTEL #6059

Description of the changes

• Added some remaining documentation to the ElasticSearch configuration that was left over from [jaeger-v2] Refactor ElasticSearch/OpenSearch configurations to have more logical groupings #6090

How was this change tested?

• CI

Checklist

• I have read https:/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.45%. Comparing base (fe700fe) to head (3ad639e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6103   +/-   ##
=======================================
  Coverage   96.45%   96.45%           
=======================================
  Files         352      352           
  Lines       19986    19986           
=======================================
  Hits        19277    19277           
  Misses        524      524           
  Partials      185      185           

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> (+0.01%)	⬆️
elasticsearch-7.x-v1	18.80% <ø> (ø)
elasticsearch-8.x-v1	18.97% <ø> (ø)
elasticsearch-8.x-v2	1.69% <ø> (?)
grpc_v1	8.78% <ø> (ø)
grpc_v2	6.72% <ø> (ø)
kafka-v1	8.99% <ø> (ø)
kafka-v2	1.70% <ø> (ø)
memory_v2	1.70% <ø> (ø)
opensearch-1.x-v1	18.85% <ø> (ø)
opensearch-2.x-v1	18.85% <ø> (ø)
opensearch-2.x-v2	1.69% <ø> (ø)
tailsampling-processor	0.48% <ø> (ø)
unittests	95.37% <ø> (ø)

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