anchor.diff:  [[release-notes-6.3.0]]
   == 6.3.0 Release Notes
   
  -coming[6.3.0]
  -
   Also see <<breaking-changes-6.3>>.
   
   [[breaking-6.3.0]]
  
positive.code: using the <<cluster-update-settings,Cluster Update Settings API>>. For more
  information, see <<monitoring-settings>>.
  
  Security::
  * The legacy `XPackExtension` extension mechanism has been removed and replaced
  with an SPI based extension mechanism that is installed and built as an
  elasticsearch plugin.
  
  
  
  [[breaking-java-6.3.0]]
  
negative.code: 
  Core::
  * Rename the bulk thread pool to write thread pool {pull}29593[#29593]
  
  Monitoring::
  * By default when you install {xpack}, monitoring is enabled but data collection
  