Update Index sizing guidelines in docs after Autosharding

[ankikuma]

Update the docs here.
Indices that are create with index version greater than or equal to SHARD_OBLIVIOUS_SLICING can grow upto 48 shards (a dynamic setting AUTO_RESHARD_MAX_SHARDS_SETTING), via Autosharding. An index is resharded (to 2x shards) when its' average shard size crosses 100GB.

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🔍 Preview links for changed docs

• deploy-manage/deploy/elastic-cloud/differences-from-other-elasticsearch-offerings.md
• deploy-manage/deploy/elastic-cloud/serverless.md
• manage-data/data-store/index-basics.md

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[yetanothertw]

Hi @ankikuma, let me know if you need any help with applying any of the suggested docs edits. Happy to take over if that's useful. 🌻

[pete-naylor]

Thanks so much for getting these changes in!

[ankikuma]

@elastic/developer-docs

[charlotte-hoblik]

Since the index-and-resource-limits section was merged up into Serverless index sizing and resource limits, that anchor no longer exists. You've already updated every in-repo link to it (I checked — nothing else in docs-content points to it), so the build is fine. The remaining gap is external and bookmarked links to …differences-from-other-elasticsearch-offerings#index-and-resource-limits: they'll now land at the top of the page instead of the limits table.

redirects.yml isn't part of this PR so I can't leave an inline suggestion, but would you be able to add an anchor redirect there? It mirrors the existing same-page anchor redirects in that file (for example the restrictions-known-problems.md entries):

  'deploy-manage/deploy/elastic-cloud/differences-from-other-elasticsearch-offerings.md':
    to: 'deploy-manage/deploy/elastic-cloud/differences-from-other-elasticsearch-offerings.md'
    anchors:
      'index-and-resource-limits': 'elasticsearch-differences-serverless-index-size'

[ankikuma]

@yetanothertw @charlotte-hoblik Thank you so much for reviewing and helping to make this doc better. I think I addressed all your comments but please let me know if I missed anything.

[ankikuma]

Looks like I need approval from @elastic/admin-docs

[wajihaparvez]

Thanks for incorporating all the admin docs edits! LGTM