[DOCS] Adds content for Kibana 6.6.0 Highlights doc (#28895)

* [DOCS] Adds content for Kibana 6.6.0 Highlights doc

* [DOCS] Minor edits to highlights doc

docs/release-notes/highlights-6.6.0.asciidoc

@@ -6,14 +6,112 @@
 
 
 Each release of {kib} brings new features and product improvements. 
-Here are the highlights of the features that were added in 6.6.0 and 
-how the user experience improved.
+Here are the highlights of the feature and user experience changes in 6.6.0.
 
 Refer to the <<release-notes-6.6.0, {kib} 6.6.0 Release Notes>> for a list of
 bug fixes and other changes.
 
 coming[6.6.0]
 
+[float]
+=== Index lifecycle policies (beta)
+
+{kib} has additional *Management* user interfaces that provide a simple, 
+user-friendly way to use advanced features.  This version introduces 
+*Index Lifecycle Policies*.  If you use time series indices, this feature can 
+help you keep your clusters tidy. You can create and manage index lifecycle policies, 
+which automate actions such as rolling over an index, relocating shards to warm 
+or cold nodes, merging shards, and deleting outdated indices.  
+See {kibana-ref}/index-lifecycle-policies.html[Index lifecycle policies].
+
+[role="screenshot"]
+image::images/highlights-6.6.0-policies.png[Create index lifecycle policies UI]
+
+[float]
+=== Remote clusters and Auto-follow pattern
+
+{kib} *Management* also has two new user interfaces for cross cluster replication. 
+*Remote clusters* helps you manage your remote clusters for use with cross cluster 
+search and cross cluster replication. You can add and remove remote clusters 
+and check their connectivity. 
+
+[role="screenshot"]
+image::images/highlights-6.6.0-add-remote-cluster.png[Add remote cluster UI]
+
+*Auto-follow pattern* helps you create and manage the remote replication process.  
+You can follow an index pattern on the remote cluster for auto-discovery and 
+then replicate new clusters that match the pattern.
+
+[role="screenshot"]
+image::images/highlights-6.6.0-auto-follow.png[Add auto-follow pattern UI]
+
+
+[float]
+=== Enhancements in Canvas (beta)
+
+Quite a few improvements made their way into Canvas. 
+
+Element grouping is now available&mdash;you can combine your favorite elements 
+and manipulate them as one. Simply hold down the *Shift* key to select a few 
+elements, and then press *G* to group them. To ungroup your grouped elements, 
+press *U*. 
+
+[role="screenshot"]
+image::images/highlights-6.6.0-canvas-grouping.gif[Canvas element grouping]
+
+This version also introduces the ability to copy and paste elements. You can copy 
+elements between pages of your workpad and across different workpads. 
+
+If you’re a CSS guru and enjoy styling your elements with custom CSS, you’ll 
+be excited to learn that Canvas supports global CSS across your entire workpad. 
+
+Finally, Canvas has two workpad templates to help you get started. You can 
+choose between a light and a dark themed workpad. Look for the *Templates* tab on 
+the Canvas home page. 
+
+[role="screenshot"]
+image::images/highlights-6.6.0-canvas-themes.png[Canvas light and dark themes]
+
+[float]
+=== Reporting: Export dashboard to a png
+You can now export dashboards as a PNG report.  This makes it easier for you to 
+share and embed your graphics in blogs, websites, and presentations. PNG 
+reporting is available in the *Share* menu from the {kib} toolbar. You must have 
+a https://www.elastic.co/subscriptions[Gold license] to use 
+https://www.elastic.co/products/stack/reporting[Reporting features].
+
+[role="screenshot"]
+image::images/highlights-6.6.0-reporting.png[Share menu]
+
+[float]
+=== Upgrade Assistant for Elasticsearch 7.0
+
+{kib}'s revised Upgrade Assistant can help you prepare for an upgrade from 
+{es} 6.x to {es} 7.0. The assistant identifies issues you need to address 
+before upgrading and simplifies the migration of indices that require reindexing.  
+You'll find this feature in *Management > {es} > Upgrade Assistant*.
+
+[role="screenshot"]
+image::images/highlights-6.6.0-upgrade-assistant.png[Share menu]
+
+[float]
+=== Support for multiple Elasticsearch nodes 
+
+For increased stability, you can now define multiple {es} nodes for {kib}. This 
+prevents {kib} from being tied to a single {es} node while allowing for the 
+requests to be distributed over multiple nodes in the cluster.  Simply set 
+`elasticsearch.host` in your kibana.yml file to the URLs of the {es} nodes you 
+want to use.  You can also configure {kib} to automatically discover other nodes 
+in the cluster (`elasticsearch.sniffOnStart`) or on an interval (`elasticsearch.sniffInterval`).
+For more information, see {kibana-ref}/settings.html[Kibana configuration settings].
+
+[float]
+=== Production version of Time Series Visual Builder
+
+{kibana-ref}/time-series-visual-builder.html[Time Series Visual Builder] is now in production use.  
+This visualization has also been enhanced to use the 
+{kibana-ref}/kuery-query.html[Kibana query language (KQL)] to filter and query data.
+
 [float]
 === Annotate your {ml} results