[Doc] Release notes for v8.4.3 (#90443) (#90538)

* Update docs for v8.4.3 release

* Update release highlights for 8.4.3 version.

* Update docs/reference/release-notes/8.4.3.asciidoc

Co-authored-by: Adam Locke <adam.locke@elastic.co>

* Update docs/reference/release-notes/8.4.3.asciidoc

Co-authored-by: Adam Locke <adam.locke@elastic.co>

* Update docs/reference/release-notes/highlights.asciidoc

Co-authored-by: Adam Locke <adam.locke@elastic.co>

* Make link external type

* Update release notes to include #90319 PR after creating BC2.

* Remove release note for #90302

* Minor grammar fix

Co-authored-by: Adam Locke <adam.locke@elastic.co>
(cherry picked from commit 25a196f21436a4a03a287667e7ce0bd573a79b0d)

# Conflicts:
#	docs/reference/release-notes.asciidoc
#	docs/reference/release-notes/highlights.asciidoc

Co-authored-by: Slobodan Adamović <slobodanadamovic@users.noreply.github.com>

docs/reference/release-notes.asciidoc

@@ -8,6 +8,7 @@ This section summarizes the changes in each release.
 
 * <<release-notes-8.6.0>>
 * <<release-notes-8.5.0>>
+* <<release-notes-8.4.3>>
 * <<release-notes-8.4.2>>
 * <<release-notes-8.4.1>>
 * <<release-notes-8.4.0>>
@@ -35,6 +36,7 @@ This section summarizes the changes in each release.
 
 include::release-notes/8.6.0.asciidoc[]
 include::release-notes/8.5.0.asciidoc[]
+include::release-notes/8.4.3.asciidoc[]
 include::release-notes/8.4.2.asciidoc[]
 include::release-notes/8.4.1.asciidoc[]
 include::release-notes/8.4.0.asciidoc[]

docs/reference/release-notes/8.4.3.asciidoc

@@ -0,0 +1,25 @@
+[[release-notes-8.4.3]]
+== {es} version 8.4.3
+
+coming[8.4.3]
+
+Also see <<breaking-changes-8.4,Breaking changes in 8.4>>.
+
+[[bug-8.4.3]]
+[float]
+=== Bug fixes
+
+Infra/Core::
+* Fix file permission errors to avoid repeated error save loops on Windows {es-pull}90271[#90271] (issue: {es-issue}90222[#90222])
+
+Ingest Node::
+* Prevent serialization errors in the nodes stats API {es-pull}90319[#90319] (issue: {es-issue}77973[#77973])
+
+[[regression-8.4.3]]
+[float]
+=== Regressions
+
+Ranking::
+* Ensure `cross_fields` always uses valid term statistics {es-pull}90314[#90314]
+
+

docs/reference/release-notes/highlights.asciidoc

@@ -40,6 +40,7 @@ with peaks of ~95% (from 600ms to 20ms).
 For both new and existing Index Lifecycle Management (ILM) policies,
 the rollover action will only execute if an index has at least one document.
 
+
 For indices with a `max_age` condition that are no longer being written
 to, this will mean that they will no longer roll over every time their
 `max_age` is reached.