Refocus the System settings page as configuration methods

[yetanothertw]

Fixes #5341

• This page now explains where and how to apply OS limits and env vars (ulimit, limits.conf, sysconfig, systemd), using placeholders instead of baking in one concrete limits.

• Also, removed some duplication with the file descriptior page.

• Important system configuration list items now have short descriptions, for better orientation.

• Realigned cross-links to the configuration methods page for how guidance on how to perfoem thse configuration changes on the host.

• Clarified ulimit: listed common options (-n, -u, -l, -a) and pointed readers to help ulimit so the source of the options is explicit.

Summary

Generative AI disclosure

1. Did you use a generative AI (GenAI) tool to assist in creating this contribution?

• Yes
• No

Used it to find other repetitions or topics that overlapped with these system settings configuration methods page.

[github-actions]

Vale Linting Results

Summary: 8 warnings, 7 suggestions found

⚠️ Warnings (8)

File	Line	Rule	Message
deploy-manage/deploy/self-managed/bootstrap-checks.md	65	Elastic.QuotesPunctuation	Place punctuation inside closing quotation marks.
deploy-manage/deploy/self-managed/bootstrap-checks.md	65	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'for example' instead of 'e.g'.
deploy-manage/deploy/self-managed/bootstrap-checks.md	65	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'for example' instead of 'e.g'.
deploy-manage/deploy/self-managed/bootstrap-checks.md	65	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'and so on' instead of 'etc'.
deploy-manage/deploy/self-managed/bootstrap-checks.md	74	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'using' instead of 'via'.
deploy-manage/deploy/self-managed/executable-jna-tmpdir.md	20	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'using' instead of 'via'.
deploy-manage/deploy/self-managed/setting-system-settings.md	92	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'using' instead of 'via'.
deploy-manage/deploy/self-managed/setting-system-settings.md	99	Elastic.Latinisms	Latin terms and abbreviations are a common source of confusion. Use 'using' instead of 'via'.

💡 Suggestions (7)

File	Line	Rule	Message
deploy-manage/deploy/self-managed/executable-jna-tmpdir.md	20	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
deploy-manage/deploy/self-managed/file-descriptors.md	18	Elastic.Versions	Use 'or later' instead of 'or higher' when referring to versions.
deploy-manage/deploy/self-managed/file-descriptors.md	22	Elastic.Wordiness	Consider using 'use' instead of 'make use of'.
deploy-manage/deploy/self-managed/important-system-configuration.md	23	Elastic.WordChoice	Consider using 'run, start' instead of 'execute', unless the term is in the UI.
deploy-manage/deploy/self-managed/setting-system-settings.md	38	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.
deploy-manage/deploy/self-managed/setting-system-settings.md	43	Elastic.WordChoice	Consider using 'refer to (if it's a document), view (if it's a UI element)' instead of 'see', unless the term is in the UI.
deploy-manage/deploy/self-managed/setting-system-settings.md	103	Elastic.WordChoice	Consider using 'can, might' instead of 'may', unless the term is in the UI.

---

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[github-actions]

🔍 Preview links for changed docs

• deploy-manage/deploy/self-managed/bootstrap-checks.md
• deploy-manage/deploy/self-managed/elasticsearch-service-user.md
• deploy-manage/deploy/self-managed/executable-jna-tmpdir.md
• deploy-manage/deploy/self-managed/file-descriptors.md
• deploy-manage/deploy/self-managed/important-system-configuration.md
• deploy-manage/deploy/self-managed/install-elasticsearch-docker-prod.md
• deploy-manage/deploy/self-managed/max-number-of-threads.md
• deploy-manage/deploy/self-managed/setting-system-settings.md
• deploy-manage/deploy/self-managed/setup-configuration-memory.md

[eedugon]

I think it's looking very good!
I've added some suggestions to clarify better where the manual approach (ulimit command or limits.conf) is necessary in the intro of the doc.

[yetanothertw]

Thanks, Edu! I've implemented all your suggestions, so this is ready for your review again, please.