[chore][docs] Add documentation to ElasticSearch configuration

[mahadzaryab1]

Which problem is this PR solving?

• Part of #6059

Description of the changes

• Added some remaining documentation to the ElasticSearch configuration that was left over from #6090

How was this change tested?

• CI

Checklist

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6103/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | Coverage Δ | | |---|---|---| | [badger_v1](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6103/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `8.42% <ø> (ø)` | | | [badger_v2](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6103/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `1.70% <ø> (ø)` | | | 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[grpc_v1](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6103/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `8.78% <ø> (ø)` | | | [grpc_v2](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6103/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `6.72% <ø> (ø)` | | | [kafka-v1](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6103/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `8.99% <ø> (ø)` | | | [kafka-v2](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6103/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `1.70% <ø> (ø)` | | | 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[tailsampling-processor](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6103/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `0.48% <ø> (ø)` | | | [unittests](https://app.codecov.io/gh/jaegertracing/jaeger/pull/6103/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=jaegertracing) | `95.37% <ø> (ø)` | | Flags with carried forward coverage won't be shown. 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