James Rodewig b6bf64b969 [DOCS] Collapse node stats response sections (#51063)
elastic/docs#1687 added support for the `[%collapsible]` Asciidoc
attribute, which creates collapsible sections in the HTML output.

This PR makes two related changes to the nodes stats API documentation:

* Makes the response parameter sections collapsible. This allows users
  to more easily navigate the page without long walls of text.

* Reorders the response parameter sections to match the default order
  returned by the API.

Relates to #47524.
2020-01-16 13:19:29 -05:00
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