[DOCS] Adds release highlight pages (#30590)

docs/reference/index-shared4.asciidoc

@@ -5,4 +5,6 @@ include::testing.asciidoc[]
 
 include::glossary.asciidoc[]
 
+include::release-notes/highlights.asciidoc[]
+
 include::{docdir}/../CHANGELOG.asciidoc[]

docs/reference/release-notes/highlights-7.0.0.asciidoc

@@ -0,0 +1,9 @@
+[[release-highlights-7.0.0]]
+== 7.0.0 release highlights
+++++
+<titleabbrev>7.0.0</titleabbrev>
+++++
+
+coming[7.0.0]
+
+See also <<breaking-changes-7.0>> and <<release-notes-7.0.0>>. 

docs/reference/release-notes/highlights.asciidoc

@@ -0,0 +1,13 @@
+[[release-highlights]]
+= {es} Release Highlights
+
+[partintro]
+--
+This section summarizes the most important changes in each release. For the 
+full list, see <<es-release-notes>> and <<breaking-changes>>. 
+
+* <<release-highlights-7.0.0>>
+
+--
+
+include::highlights-7.0.0.asciidoc[]