[ElasticsearchClient] Update Semantic Conventions

[martincostello]

• Fixes [feature request] ElasticSearch - update network semantic convention #2302
• Fixes [feature request] replace usages of net.peer.* with server.* #2976
• Contributes to Add schema URL to ActivitySources and Meters #4064

Changes

Update the Semantic Conventions to v1.43.0 when OTEL_SEMCONV_STABILITY_OPT_IN=database (or database/dup) is enabled.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

❌ Patch coverage is 93.12977% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.55%. Comparing base (820d955) to head (1caa3b6).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
.../ElasticsearchRequestPipelineDiagnosticListener.cs	92.74%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4635      +/-   ##
==========================================
+ Coverage   77.29%   77.55%   +0.25%     
==========================================
  Files         466      466              
  Lines       19707    19568     -139     
==========================================
- Hits        15233    15175      -58     
+ Misses       4474     4393      -81     

Flag	Coverage Δ
unittests-Instrumentation.ElasticsearchClient	85.76% <93.12%> (+5.39%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...lient/ElasticsearchClientInstrumentationOptions.cs	100.00% <100.00%> (ø)
.../ElasticsearchRequestPipelineDiagnosticListener.cs	88.23% <92.74%> (+3.98%)	⬆️

... and 26 files with indirect coverage changes

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[Copilot]

Pull request overview

Updates the ElasticsearchClient instrumentation to support the newer database semantic conventions (v1.42.0) behind OTEL_SEMCONV_STABILITY_OPT_IN=database (or database/dup), including emitting the corresponding new attributes and using schema URLs via ActivitySourceFactory.

Changes:

• Added opt-in logic (via OTEL_SEMCONV_STABILITY_OPT_IN) to emit old, new, or both sets of database-related attributes.
• Updated span naming/tagging to align with the newer conventions (e.g., db.operation.name, db.system.name, server.address, db.response.status_code, error.type).
• Added/expanded unit tests to validate the new/dual emission behaviors and opt-in parsing.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/OpenTelemetry.Instrumentation.ElasticsearchClient.Tests/ElasticsearchClientTests.cs	Adds coverage for new/dual semantic convention emission and span naming.
test/OpenTelemetry.Instrumentation.ElasticsearchClient.Tests/ElasticsearchClientInstrumentationOptionsTests.cs	Verifies environment-variable opt-in parsing for old/new/dup behavior.
src/OpenTelemetry.Instrumentation.ElasticsearchClient/README.md	Updates semantic convention reference links to v1.42.0 anchors.
src/OpenTelemetry.Instrumentation.ElasticsearchClient/OpenTelemetry.Instrumentation.ElasticsearchClient.csproj	Links additional shared helpers required for schema URL and semantic convention opt-in support.
src/OpenTelemetry.Instrumentation.ElasticsearchClient/Implementation/ElasticsearchRequestPipelineDiagnosticListener.cs	Implements new attribute emission, schema URL selection, db.operation.name derivation, and new span naming rules.
src/OpenTelemetry.Instrumentation.ElasticsearchClient/ElasticsearchClientInstrumentationOptions.cs	Adds opt-in initialization (env var) and internal flags controlling old/new attribute emission.
src/OpenTelemetry.Instrumentation.ElasticsearchClient/CHANGELOG.md	Documents the new semantic convention opt-in behavior and attribute mapping changes.

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