Add more Elasticsearch documentation
What does this MR do and why?
- Adds links to useful Elasticsearch admin pages
- Adds a troubleshooting section to analytics.md
I'd started to add this to the infrastructure runbook for the Docs site, but it'll be easier to maintain this content in our project repo, and then link back here from the runbook.
Merge request acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this merge request.