Add release notes for 8.9.3 (#7934) (#7937)

Co-authored-by: Florian Bernd <git@flobernd.de>

Author: github-actions[bot]

docs/release-notes/release-notes-8.9.3.asciidoc

@@ -0,0 +1,10 @@
+[[release-notes-8.9.3]]
+== Release notes v8.9.3
+
+[discrete]
+=== Features & Enhancements
+
+- https://github.com/elastic/elasticsearch-net/pull/7894[#7894] Reintroduce suggestion feature (issue: https://github.com/elastic/elasticsearch-net/issues/7390[#7390])
+- https://github.com/elastic/elasticsearch-net/pull/7923[#7923] Add `PercentilesAggregation` and `PercentileRanksAggregation` (issue: https://github.com/elastic/elasticsearch-net/issues/7879[#7879])
+- https://github.com/elastic/elasticsearch-net/pull/7914[#7914] Update `Elastic.Transport` dependency
+- https://github.com/elastic/elasticsearch-net/pull/7920[#7920] Regenerate client using the latest specification

docs/release-notes/release-notes.asciidoc

@@ -6,6 +6,7 @@
 [discrete]
 == Version 8.9
 
+* <<release-notes-8.9.3,Release notes v8.9.3>>
 * <<release-notes-8.9.2,Release notes v8.9.2>>
 * <<release-notes-8.9.1,Release notes v8.9.1>>
 * <<release-notes-8.9.0,Release notes v8.9.0>>
@@ -34,6 +35,7 @@
 * <<release-notes-8.0.0,Release notes v8.0.0>>
 
 include::breaking-change-policy.asciidoc[]
+include::release-notes-8.9.3.asciidoc[]
 include::release-notes-8.9.2.asciidoc[]
 include::release-notes-8.9.1.asciidoc[]
 include::release-notes-8.9.0.asciidoc[]