Add a guide for upgrading and migrating ES indices

[dhruvkb]

Fixes

Fixes #3314 by @dhruvkb

Description

This PR documents the process for upgrading and migrating ES indices without API downtime. It also adds documentation regarding the ingestion server /task API that the process uses and also documents the process for stopping a reindex job midway in staging.

Testing Instructions

Read the updated documentation.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
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• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (if applicable).

Developer Certificate of Origin

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[obulat]

Thank you for such detailed and clear documentation, @dhruvkb !

[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/3321

Please note that GitHub pages takes a little time to deploy newly pushed code, if the links above don't work or you see old versions, wait 5 minutes and try again.

You can check the GitHub pages deployment action list to see the current status of the deployments.

New files ➕:

• https://docs.openverse.org/_preview/3321/ingestion_server/guides/migrate.html
• https://docs.openverse.org/_preview/3321/ingestion_server/guides/troubleshoot.html
• https://docs.openverse.org/_preview/3321/ingestion_server/guides/upgrade.html
• https://docs.openverse.org/_preview/3321/ingestion_server/reference/task_api.html

Changed files 🔄:

• https://docs.openverse.org/_preview/3321/ingestion_server/guides/index.html
• https://docs.openverse.org/_preview/3321/ingestion_server/reference/index.html

[obulat]

Awesome 🎉

[AetherUnbound]

This is fantastic documentation Dhruv, thank you for taking the time to distill all the steps you took with the recent deployments! I have a few suggestions/improvements, nothing to block a merge 🚀 📓