Update heap setting documentation in light of machine dependent heap

[mark-vieira]

Documentation updates to our heap size recommendations as a follow up to #65905.

[elasticmachine]

Pinging @elastic/es-docs (Team:Docs)

[jrodewig]

This looks good to me overall. I left a few comments and suggestions but nothing blocking.

I think creating the Advanced configuration settings page is a good move. However, we probably want to tell users that they shouldn't mess with these unless they know what they're doing. We get a lot of search traffic, and I could see someone landing here without other context.

It may also be worth auditing some of our xrefs to the current heap size settings. I found one during the review, but there may be others. I can do that as a separate effort if wanted though.

Thanks @mark-vieira!

[jrodewig]

You may want to add a couple brief sentences before the heap size heading. I'd just note:

• We recommend using default settings in most production use cases
• These settings are for experts only.

If someone lands on this page from Google, they should see "There be dragons here."

[mark-vieira]

I've added some language here.

[jrodewig]

New copy looks great to me! Thanks!

[mark-vieira]

Thanks for the review @jrodewig! I've applied your suggested and made a couple other minor tweaks.