chore(elasticsearch sink): Implement OpenSearch E2E tests

[taisho6339]

Summary

I've implemented OpenSearch integration tests for verifying OpenSearch compatibility.

Vector configuration

How did you test this PR?

vdev int test elasticsearch

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

closes: #16761

Notes

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[pront]

Nice!

[thomasqueirozb]

Some integration tests failed in the merge queue unfortunately 😕