NPE in MlAssignmentNotifier#auditMlTasks #87002
Description
Elasticsearch Version
8.2.0 (likely others)
Installed Plugins
No response
Java Version
bundled
OS Version
Cloud
Problem Description
I saw a NPE in MlAssignmentNotifier#auditMlTasks which looks to be due to the PersistentTasksCustomMetadata being completely missing (i.e. null) rather than simply empty.
Steps to Reproduce
Unknown
Logs (if relevant)
[instance-0000000000] uncaught exception in thread [elasticsearch[instance-0000000000][generic][T#5]] java.lang.NullPointerException: Cannot invoke "org.elasticsearch.persistent.PersistentTasksCustomMetadata.tasks()" because "currentTasks" is null at org.elasticsearch.xpack.ml.MlAssignmentNotifier.auditMlTasks(MlAssignmentNotifier.java:96) ~[?:?] at org.elasticsearch.xpack.ml.MlAssignmentNotifier.auditChangesToMlTasks(MlAssignmentNotifier.java:76) ~[?:?] at org.elasticsearch.xpack.ml.MlAssignmentNotifier.lambda$clusterChanged$0(MlAssignmentNotifier.java:64) ~[?:?] at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:714) ~[elasticsearch-8.2.0.jar:8.2.0] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[?:?] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[?:?] at java.lang.Thread.run(Thread.java:833) [?:?]