[DOCS] Adds 7.3 Release Highlights (#42043)

* [DOCS] Adds 7.3 Release Highlights

* [DOCS] Removes some of the images in the Canvas highlights

* [DOCS] Updates content in 7.3 highlights

docs/release-notes/highlights-7.3.0.asciidoc

@@ -10,10 +10,173 @@ Here are the highlights of the feature and user experience changes in 7.3.0.
 Refer to the {kib} <<breaking-changes-7.3, breaking changes>> and <<release-notes-7.3.0, 
 release notes>> for a list of bug fixes and other changes.
 
-coming[7.3.0]
-
 //NOTE: The notable-highlights tagged regions are re-used in the
 //Installation and Upgrade Guide
 
+* <<maps-7.3, Maps app is now production ready>>
+* <<kerberos-7.3, Kerberos authentication provider>>
+* <<snapshot-7.3, Snapshot phase 2: restore and delete>>
+* <<csv-export-7.3, CSV export from a saved search>>
+* <<canvas-7.3, Canvas templates&comma; experiences&comma; and documentation>>
+* <<KQL-7.3, KQL + autocomplete in filter aggregations>>
+* <<bar-charts-7.3, Values inside bar charts>>
+* <<visual-builder-7.3, Visual Builder: even better under a new name>>
+
+[float]
+[[maps-7.3]]
+=== Maps app is now production ready
+
+Maps is production ready for 7.3, and includes many improvements, including
+a new GeoJson upload and improved layer styling, aggregations, and tooltips.
+To find out what’s in Maps and how to use it, go to the <<maps, Maps documentation>>.
+
+[role="screenshot"]
+image::release-notes/images/7.3-maps.png[Maps is production ready]
+
+
+[float]
+==== Upload GeoJSON data (beta)
+
+Maps now makes it easier for you to get your geospatial data into the Elastic Stack. 
+Use the new GeoJSON upload feature to drag and drop your point, shape files, 
+and features directly into {es}, so you can use them as layers in the map.
+
+[float]
+==== More layer styling
+
+Maps gives you more options for styling your layers. You can now select the 
+color ramp for heatmap layers. You can also symbolize geo_point features with icons that you can color, size, and rotate based on property values.
+
+[float]
+==== New top hits aggregation
+
+The new top hits aggregation enables you to plot the most recent entities from your {es} indices.
+
+[float]
+==== Better tooltip content
+
+Maps now helps you create more in-depth tooltip content. Your tooltips can
+display information on each feature at the current location.
+To cycle through the features and view their properties, use the tooltip page controls. 
+You can also include custom labels for Grid aggregation and join metrics. 
+
+[float]
+[[kerberos-7.3]]
+=== Kerberos authentication provider
+
+{es} provides support for Kerberos starting in 6.6, and in 7.3, 
+{kib} introduces Kerberos authentication provider. You now have single sign-on 
+access and can log into {kib} without repeatedly providing your username and password.  
+For details, see <<kibana-authentication, SAML single sign-on>>.
+
+[float]
+[[snapshot-7.3]]
+=== Snapshot phase 2: restore and delete
+
+The second phase of the snapshot management UI is out, and includes 
+two notable enhancements: restore and delete. You can recover data and state 
+from a snapshot using the new *Restore* wizard, and track its progress in the 
+*Restore Status* view. You can delete snapshots, and free up repository storage space,
+in the *Snapshots* view.  For more information, see <<snapshot-repositories, Snapshot and Restore>>.
+
+[role="screenshot"]
+image::release-notes/images/7.3-snapshot-restore.png[Snapshot and restore phase 2]
+
+[float]
+[[csv-export-7.3]]
+=== CSV export from a saved search
+
+{kib} now allows you to export a saved search on a dashboard directly to CSV. 
+This action is available in the dashboard panel menu for the saved search. 
+To enable this feature, you must set 
+`xpack.reporting.csv.enablePanelActionDownload: true` in your `kibana.yml` file.
+
+[role="screenshot"]
+image::release-notes/images/7.3-csv-export.png[CSV export from saved search]
+
+[float]
+[[canvas-7.3]]
+=== Canvas templates, experiences, and documentation
+
+Canvas improves the user experience with new templates, experiences, and documentation.
+
+[float]
+==== Templates
+
+Canvas is all about creating content and telling a story with your data. The 
+content templates can help you facilitate this vision, and in 
+7.3, Canvas releases three new templates:
+
+* Pitch is a 14-page template that you can brand and customize for your 
+next board-level presentation.
+
+* The Status template gives you a professional template 
+for status reports and other updates. 
+
+* The Summary template, shown below, can help you create a report with live representations 
+of your data.
++
+[role="screenshot"]
+image::release-notes/images/7.3-canvas-summary.png[Canvas summary template]
+
+[float]
+==== Experiences
+
+Canvas adds a number of experiences in 7.3: nudge, alignment, distribution, 
+zoom, and fit-to-screen. Nudge enables you to more precisely align elements 
+in your workpad.  Use the up, down, left, or right arrow key to nudge an 
+element by 10 pixels.  To nudge an element by 1 pixel, use Shift + an arrow key.
+
+[float]
+==== Documentation
+
+Check out the 
+updated <<canvas-getting-started, Getting started guide>>, the new introduction to <<canvas-workpad, Canvas workpads>>, 
+and the improved <<canvas-function-reference, Canvas function reference>>. 
+
+[float]
+[[KQL-7.3]]
+=== KQL + autocomplete in filter aggregations
+
+In 7.0 and later, the {kib} query language (KQL) is enabled by default, 
+making it easier to create queries. If you have a Basic license or above, 
+autocomplete is also enabled. Starting in 7.3, {kib} expands KQL and 
+autocomplete support to include filter aggregations in Visualize and 
+TSVB. Just start typing, and you’ll get suggestions for fields, values 
+for keyword fields, and query operators.
+
+[role="screenshot"]
+image::release-notes/images/7.3-kql.png[Canvas summary template]
+
+[float]
+[[bar-charts-7.3]]
+=== Values inside bar charts
+
+You can now show values directly inside a bar chart, if space is available.  
+When you create the bar chart, open Panel Settings and select *Show values on chart*.  
+
+[role="screenshot"]
+image::release-notes/images/7.3-bar-charts.png[Canvas summary template]
+
+[float]
+[[visual-builder-7.3]]
+=== Visual Builder: even better under a new name
+
+Time Series Visual Builder is now simply referred to as TSVB. When you open 
+TSVB, you’ll also notice several enhancements
+and bug fixes. 
+
+[float]
+=== Give us your feedback
+
+Enjoy all the new features and functionality in {kib} 7.3. 
+Play around with them locally or on the https://www.elastic.co/products/elasticsearch/service[{es} Service] 
+and reach out on the 
+https://discuss.elastic.co/c/kibana[{kib} Discuss forum] if you have any questions or feedback.
+
+
+
+
+
 // tag::notable-highlights[]
 // end::notable-highlights[]