Adds Beats highlights to Install Upgrade Guide (#277)

Author: lcawl

docs/en/install-upgrade/highlights.asciidoc

@@ -4,9 +4,23 @@
 Each release brings new features and product improvements. This section
 highlights notable new features and enhancements in {version}.
 
+** <<beats-highlights,Beats>>
 ** <<elasticsearch-highlights,{es}>>
 ** <<kibana-higlights,{kib}>>
 
+[[beats-highlights]]
+=== Beats highlights
+++++
+<titleabbrev>Beats</titleabbrev>
+++++
+
+coming[7.0.0]
+
+This list summarizes the most important enhancements in Beats.
+For the complete list, go to {beats-ref}/release-highlights.html[Beats release highlights].
+
+include::{beats-repo-dir}/highlights-7.0.0.asciidoc[tag=notable-highlights]
+
 [[elasticsearch-highlights]]
 === {es} highlights
 [subs="attributes"]