[TEST] add a test for ElasticSearchRecordable

[sjinks]

Changes

This PR adds a test for opentelemetry::exporter::logs::ElasticSearchRecordable and updates the (disabled) tests for Elasticsearch Logs Exporter to ensure they compile.

The plan is to refactor the ES Recordable to use the ADL Serializer. This will make the code much more readable and maintainable (no need to use nostd::holds_alternative or value.index() + nostd::get() and keep the list of the types up-to-date). That is why we need a test to make sure that the refactoring will not break the things.

For significant contributions please make sure you have completed the following items:

• [ ] CHANGELOG.md updated for non-trivial changes
• [ ] Unit tests have been added
• [ ] Changes in public API reviewed

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[codecov[bot]]

Codecov Report

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

Project coverage is 87.84%. Comparing base (4d9cc28) to head (b006b8d).

Additional details and impacted files

[](https://app.codecov.io/gh/open-telemetry/opentelemetry-cpp/pull/3154?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry) ```diff @@ Coverage Diff @@ ## main #3154 +/- ## ========================================== - Coverage 87.86% 87.84% -0.01% ========================================== Files 195 195 Lines 6151 6151 ========================================== - Hits 5404 5403 -1 - Misses 747 748 +1 ``` [see 1 file with indirect coverage changes](https://app.codecov.io/gh/open-telemetry/opentelemetry-cpp/pull/3154/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-telemetry)

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[sjinks]

Bazel on MacOS and IWYU failed for unrelated to this PR reasons; I cannot restart these jobs.

[marcalff]

Waiting a bit for possible comments, then will merge.