Revert "6.2 release notes" due to suspected doc build failure.

This reverts commit aadcad2ffd.

docs/static/releasenotes.asciidoc

@@ -3,7 +3,6 @@
 
 This section summarizes the changes in the following releases:
 
-* <<logstash-6-2-0,Logstash 6.2.0>>
 * <<logstash-6-1-3,Logstash 6.1.3>>
 * <<logstash-6-1-2,Logstash 6.1.2>>
 * <<logstash-6-1-1,Logstash 6.1.1>>
@@ -15,35 +14,6 @@ See also:
 * <<release-notes-xls>>
 endif::include-xpack[]
 
-[[logstash-6-2-0]]
-=== Logstash 6.2.0 Release Notes
-
-* Added support to protect sensitive settings and configuration in a https://www.elastic.co/guide/en/logstash/current/keystore.html[keystore]
-* Added https://www.elastic.co/guide/en/logstash/current/plugins-filters-jdbc_static.html[JDBC static filter] as a default plugin
-* Set better defaults to allow for higher throughput under load. https://github.com/elastic/logstash/issues/8707[#8707] https://github.com/elastic/logstash/issues/8702[#8702]
-* Set default configuration for RPM/DEB/Docker installations to use https://www.elastic.co/guide/en/logstash/current/multiple-pipelines.html[Multiple pipelines]
-* Added default max size value (100MB) for log files.
-* Added compression when log files are rolled (for ZIP-based installs).
-* Added ability to specify `--pipeline.id` from the command line https://github.com/elastic/logstash/issues/8868[#8868]
-* Implemented continued improvements to the next generation of execution. Give it a try with the command line switch `--experimental-java-execution`
-
-==== Plugins
-
-*JDBC Static Filter*
-
-* Initial release
-
-*Dissect Filter*
-
-* Bug fixes. See plugin release notes for https://github.com/logstash-plugins/logstash-filter-dissect/blob/master/CHANGELOG.md#113[1.1.3]
-
-*Grok Filter*
-
-* Fix thread leak on when Logstash is reloaded
-
-*Kafka Output*
-
-* Improve error logging when a producer cannot be created.
 
 [[logstash-6-1-3]]
 === Logstash 6.1.3 Release Notes