[DOCS] Adds 7.1.0 release highlights

Author: lcawl

docs/reference/release-notes/highlights-7.1.0.asciidoc

@@ -0,0 +1,16 @@
+[[release-highlights-7.1.0]]
+== 7.1.0 release highlights
+++++
+<titleabbrev>7.1.0</titleabbrev>
+++++
+
+coming[7.1.0]
+
+////
+The following section is re-used in the Installation and Upgrade Guide
+[[notable-highlights-7.1.0]]
+=== Notable breaking changes
+////
+// tag::notable-highlights[]
+
+// end::notable-highlights[]

docs/reference/release-notes/highlights.asciidoc

@@ -9,8 +9,10 @@
 This section summarizes the most important changes in each release. For the 
 full list, see <<es-release-notes>> and <<breaking-changes>>. 
 
+* <<release-highlights-7.1.0>>
 * <<release-highlights-7.0.0>>
 
 --
 
+include::highlights-7.1.0.asciidoc[]
 include::highlights-7.0.0.asciidoc[]