Add release notes for 8.4.1

Author: miriam-eid

Diff for: docs/guide/release-notes.asciidoc

@@ -1,6 +1,7 @@
 [[release-notes]]
 == Release notes
 
+* <<rn-8-4-1>>
 * <<rn-8-4-0>>
 * <<rn-8-3-3>>
 * <<rn-8-3-2>>
@@ -15,6 +16,12 @@
 * <<rn-8-1-0>>
 * <<rn-8-0-0>>
 
+[discrete]
+[[rn-8-4-1]]
+=== 8.4.1 (2022-09-06)
+
+* Client is compatible with Elasticsearch 8.4.1
+
 [discrete]
 [[rn-8-4-0]]
 === 8.4.0 (2022-08-25)