docs: pipeline: outputs: elasticsearch: opensearch: document YAML quoting for strftime values

[eschabell]

• Add note that strftime format values beginning with % (logstash_dateformat, time_key_format) must be quoted in YAML, since % is a reserved character and an unquoted value like logstash_dateformat: %Y.%m.%d fails to parse
• Fix MD060 table alignment in the write_operation tables
• Fix MD060 header spacing in the OpenSearch parameters table

Fixes #2624

Summary by CodeRabbit

• Documentation
  • Added guidance to quote YAML strftime values beginning with % to prevent parsing errors.
  • Improved formatting and readability of configuration and write-operation tables for Elasticsearch and OpenSearch outputs.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 67f16b5d-bf0f-4282-af01-9af8f64234db

📥 Commits

Reviewing files that changed from the base of the PR and between e913342 and 7c8fd00.

📒 Files selected for processing (2)

• pipeline/outputs/elasticsearch.md
• pipeline/outputs/opensearch.md

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📝 Walkthrough

Walkthrough

Elasticsearch and OpenSearch documentation now explain YAML quoting for strftime formats beginning with % and reformat existing configuration and write_operation tables.

Changes

Output documentation

Layer / File(s)	Summary
strftime YAML guidance pipeline/outputs/elasticsearch.md, pipeline/outputs/opensearch.md	Adds informational guidance to quote YAML strftime values beginning with % and adjusts an OpenSearch table separator.
write_operation tables pipeline/outputs/elasticsearch.md, pipeline/outputs/opensearch.md	Reformats the write_operation Markdown tables without changing the supported operations or descriptions.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• fluent/fluent-bit-docs#2428: Updates overlapping Elasticsearch documentation for logstash_dateformat, time_key_format, and write_operation.

Suggested labels: 5.0

Suggested reviewers: patrick-stephens, cosmo0920

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the docs change about quoting YAML strftime values for Elasticsearch/OpenSearch outputs.
Linked Issues check	✅ Passed	The docs now clarify that logstash_dateformat and similar strftime values starting with % must be quoted, matching #2624.
Out of Scope Changes check	✅ Passed	The table formatting updates are documentation-only and align with the stated PR objectives, so no unrelated changes stand out.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[eschabell]

@patrick-stephens ready for review!