When the current master node is shutting down, it sends a leave request to the other nodes so that they can eagerly start a fresh master election. Unfortunately, it was still possible for the master node that was shutting down to respond to ping requests, possibly influencing the election decision as it still appeared as an active master in the ping responses. This commit ensures that UnicastZenPing does not respond to ping requests once it's been closed. ZenDiscovery.doStop() continues to ensure that the pinging component is first closed before it triggers a master election.

Closes #27328

When the current master node is shutting down, it sends a leave request to the other nodes so that they can eagerly start a fresh master election. Unfortunately, it was still possible for the master node that was shutting down to respond to ping requests, possibly influencing the election decision as it still appeared as an active master in the ping responses. This commit ensures that UnicastZenPing does not respond to ping requests once it's been closed. ZenDiscovery.doStop() continues to ensure that the pinging component is first closed before it triggers a master election.

Closes #27328

When the current master node is shutting down, it sends a leave request to the other nodes so that they can eagerly start a fresh master election. Unfortunately, it was still possible for the master node that was shutting down to respond to ping requests, possibly influencing the election decision as it still appeared as an active master in the ping responses. This commit ensures that UnicastZenPing does not respond to ping requests once it's been closed. ZenDiscovery.doStop() continues to ensure that the pinging component is first closed before it triggers a master election.

Closes #27328

* es/master: (24 commits)
  Reduce synchronization on field data cache
  add json-processor support for non-map json types (#27335)
  Properly format IndexGraveyard deletion date as date (#27362)
  Upgrade AWS SDK Jackson Databind to 2.6.7.1
  Stop responding to ping requests before master abdication (#27329)
  [Test] Fix POI version in packaging tests
  Allow affix settings to specify dependencies (#27161)
  Tests: Improve size regex in documentation test (#26879)
  reword comment
  Remove unnecessary logger creation for doc values field data
  [Geo] Decouple geojson parse logic from ShapeBuilders
  [DOCS] Fixed link to docker content
  Plugins: Add versionless alias to all security policy codebase properties (#26756)
  [Test] #27342 Fix SearchRequests#testValidate
  [DOCS] Move X-Pack-specific Docker content (#27333)
  Fail queries with scroll that explicitely set request_cache (#27342)
  [Test] Fix S3BlobStoreContainerTests.testNumberOfMultiparts()
  Set minimum_master_nodes to all nodes for REST tests (#27344)
  [Tests] Relax allowed delta in extended_stats aggregation (#27171)
  Remove S3 output stream (#27280)
  ...

* 6.x: (27 commits)
  Reduce synchronization on field data cache
  [Test] #27342 Fix SearchRequests#testValidate
  Fail queries with scroll that explicitely set request_cache (#27342)
  add json-processor support for non-map json types (#27335)
  Upgrade AWS SDK Jackson Databind to 2.6.7.1
  Properly format IndexGraveyard deletion date as date (#27362)
  Stop responding to ping requests before master abdication (#27329)
  [Test] Fix POI version in packaging tests
  Added release notes for 6.0.0
  Update 6.0.0-beta1.asciidoc
  Allow affix settings to specify dependencies (#27161)
  Tests: Improve size regex in documentation test (#26879)
  reword comment
  Ensure external refreshes will also refresh internal searcher to minimize segment creation (#27253)
  Remove unnecessary logger creation for doc values field data
  [DOCS] Fixed link to docker content
  Plugins: Add versionless alias to all security policy codebase properties (#26756)
  [DOCS] Move X-Pack-specific Docker content (#27333)
  [Test] Fix S3BlobStoreContainerTests.testNumberOfMultiparts()
  Set minimum_master_nodes to all nodes for REST tests (#27344)
  ...