Search: sync agg/aggs synonym with website-search-data

[Mpdreamz]

Summary

• Adds an agg/aggs => aggregations synonym group to config/search.yml, matching the entry website-search-data's IndexTimeSynonyms.Docs list now expects.
• Adds "agg" to the fixedSynonyms subset in ElasticsearchMarkdownExporter, so the group is baked into the index-time analyzer (synonyms_fixed_filter) the same way esql, data-stream(s), and machine-learning already are, rather than only landing in the updateable search-time set.

Coordinated with the parallel relevance work in elastic/website-search-data (commit e6cfa72), whose IndexTimeSynonyms.Docs comment explicitly calls out staying in sync with this file.

Test plan

• dotnet build src/Elastic.Markdown succeeds
• dotnet format / lint clean (pre-push hook passed)
• Confirm the derived index-time synonym list (esql, data-stream, data-streams, machine-learning, agg) matches IndexTimeSynonyms.Docs in website-search-data byte-for-byte before reindexing

[github-actions]

Label error. Requires exactly 1 of: automation, breaking, bug, changelog:skip, chore, ci, dependencies, documentation, enhancement, feature, fix, redesign. Found:

[coderabbitai]

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ℹ️ Recent review info

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Run ID: 3a507466-6af6-4a78-a6f7-990c4ccf2004

📥 Commits

Reviewing files that changed from the base of the PR and between f3410ff and 8cea1b8.

📒 Files selected for processing (2)

• config/search.yml
• src/Elastic.Markdown/Exporters/Elasticsearch/ElasticsearchMarkdownExporter.cs

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📝 Walkthrough

Walkthrough

This change adds "agg" as a new synonym mapping to "aggregations" in the search configuration file, and correspondingly updates the hardcoded fixed synonyms list in the Elasticsearch exporter's constructor to include "agg", ensuring consistency between the search-time synonym configuration and the index-time synonym set baked into the search index analyzer.

Related PRs: None specified

Suggested labels: search, config

Suggested reviewers: None specified

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: keeping the agg/aggs synonym in sync with website-search-data.
Description check	✅ Passed	The description is directly related to the synonym sync changes and explains the intent and test plan.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch relevance/synonym-sync

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