[DOCS] 6.3.0 release highlights doc (#19634)

* [DOCS] 6.3.0 release highlights doc

* [DOCS] Fixed typo

* [DOCS] Updated images in highlights doc

* [DOCS] Incorporated review comments

* [DOCS] Updated text on autocomplete as per review comments

* [DOCS] Adds ML items to Kibana 6.3.0 highlights

* [DOCS] Clarifies custom URL highlight

* [DOCS] Improved text for autocomplete

docs/release-notes/highlights-6.3.0.asciidoc

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+[[release-highlights-6.3.0]]
+== 6.3.0 Release Highlights
+++++
+<titleabbrev>6.3.0</titleabbrev>
+++++
+
+Each release of {kib} brings new features and product improvements. Here are the 
+highlights of the features that were added in 6.3 and how the user experience 
+improved.
+
+Refer to the <<release-notes-6.3.0, {kib} 6.3 Release Notes>> for a list bug 
+fixes and other changes.
+
+[float]
+=== License management and {xpack} code
+
+Starting with version 6.3, all of the free {xpack} features, such as monitoring, 
+CSV exports, Search Profiler, Grok Debugger, and dedicated APM UIs, 
+ship with the default distribution of {kib}.  When you install {kib}, it 
+generates a Basic license with no expiration date.
+
+You can view the status of your license, update your license, or start a 30-day 
+trial of https://www.elastic.co/subscriptions[Platinum features] in *Management 
+> License Management*. The trial enables you to try out features such as security, 
+machine learning, alerting, graph capabilities, and more.
+
+At the end of the trial period, your license reverts to a Basic license. To 
+continue using the Platinum features, you can purchase a
+https://www.elastic.co/subscriptions[subscription] and update your license.
+
+[role="screenshot"]
+image::images/management_basic_license.png[]
+
+[float]
+=== Autocomplete in the query bar
+
+{kib}'s experimental autocomplete and simple syntax features can help you 
+create queries. To turn these features on, click *Options* on the right of the 
+query bar and opt in. Once enabled, just start typing in the query bar, and 
+you'll get suggestions for fields, values for keyword fields, and query operators.
+
+[role="screenshot"]
+image::images/query-bar-autocomplete.png[]
+
+
+[float]
+=== Return to recently viewed content
+
+{kib} now keeps track of your recently viewed items so that you can easily get 
+back to them.  Here's how:
+
+* Your last five recently viewed items are listed at the top of the home page. 
+A dropdown menu provides access to views further back in history.
+
+* Your recently selected time ranges are listed in the Recent tab in the time 
+picker.
+
+
+[float]
+=== Smaller grid dimensions for dashboards
+
+{kib} 6.3 gives you more control over panel sizes when creating a dashboard.  
+This gives you better control over the layout.  Here are the changes:
+
+* The grid height of the dashboard was decreased from 100 pixels to 20 pixels.
+
+* The number of columns in the grid was increased from 12 to 48.
+
+
+[float]
+=== Chained input controls
+
+The <<controls, Controls visualization>> now enables you to chain dropdown menus.
+When chained, the value selected in the first menu filters the terms in the second 
+menu. A chained menu is only enabled when its ancestor controls have values.
+
+[float]
+=== Index Management UI
+
+The new <<managing-indices,Index management>> UI enables you to view index 
+settings, mappings, and statistics and perform management operations. These 
+include refreshing, flushing, clearing the cache, merging segments, and closing 
+or deleting indices. The UI provides a convenient way to perform bulk operations
+on multiple indices.
+
+[role="screenshot"]
+image::images/management_index_bulk.png[Index Management UI]
+
+[float]
+=== Interactive map support in Vega
+
+You can now use <<vega-graph, Vega graphs>> to overlay a  geographic data visualization 
+on a map.  To start a Vega visualization, open the Visualization application and
+click the *+* button. Scroll to the *Others* section and select *Vega*.
+
+[float]
+=== Easily enable monitoring from the UI
+
+In 6.3, the first time you open {kib} monitoring, data collection is disabled,
+and you are prompted to turn it on. If you have permission to turn on data 
+collection, and there is data in the cluster, {kib} displays the monitoring
+dashboards. If {kib} can't activate monitoring, you'll get a message with 
+suggestions to try.
+
+[float]
+=== Enhancements to the Console
+
+The autocompletion feature in the Dev Tools Console is now expanded to use all 
+{kib} and Basic {xpack} APIs.  
+
+[float]
+=== APM Watcher Assistant
+
+The new *Watcher assistant* UI enables you to easily generate watches that alert 
+you to errors in your APM data. You can specify an error group occurrence threshold
+and a trigger schedule. At a fixed interval (minutes/hours/daily), you will get
+an email or slack notification if an error group has more than the specified 
+number of occurrences.
+
+[role="screenshot"]
+image::images/management_watcher_assistant.png[Index Management UI]
+
+[float]
+=== Job validation
+
+There is now an option in the {ml} job creation wizards to validate your choices
+before you create the job. The wizards provide advice based on your settings and 
+the characteristics of your data. For example, you might be advised to reconsider 
+your bucket span or choice of influencers. By heeding these suggestions, you can 
+create jobs that are more likely to produce insightful machine learning results. 
+For more information, see <<job-tips>>.
+
+[float]
+=== Custom URL improvements
+
+The inclusion of custom URLs in your {ml} jobs enables users to follow links 
+from the anomalies table in the *Anomaly Explorer* and the *Single Metric Viewer* 
+to your URL of choice. For example, you could create a link to an operational 
+dashboard that provides contextual information to help explain the anomaly. The 
+custom URL can include targeted date ranges and optional query parameters as 
+string substitutions.  As a result, custom URLs have been challenging to create. 
+In 6.3, when you edit your job in {kib}, there are new custom URL options to 
+help you create a link to the *Discover* page, new controls for configuring the 
+time range of the target page, and a button to test the URL.