[CI] MlJobIT testCreateJobInCustomSharedIndexUpdatesMapping failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #5740 / openjdk17_checkpart4_java-matrix
• elasticsearch-periodic-platform-support #5681 / sles-15_platform-support-unix

Reproduction Line:

./gradlew ":x-pack:plugin:ml:qa:native-multi-node-tests:javaRestTest" --tests "org.elasticsearch.xpack.ml.integration.MlJobIT.testUsage" -Dtests.seed=41B9F6A58342A628 -Dtests.locale=sa-Deva-IN -Dtests.timezone=UCT -Druntime.java=17

Applicable branches:
8.x

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: 2 active tasks found:
cluster:admin/xpack/ml/job/close    cbWbf3R6RvCmXqGtnCABjg:21761 -                            transport  1736258934685 14:08:54 4.8m        127.0.0.1 javaRestTest-2 
cluster:admin/xpack/ml/job/close[n] cbWbf3R6RvCmXqGtnCABjg:21767 cbWbf3R6RvCmXqGtnCABjg:21761 transport  1736258934697 14:08:54 4.8m        127.0.0.1 javaRestTest-2 
 expected:<0> but was:<2>

Issue Reasons:

• [8.x] 2 failures in test testCreateJobInCustomSharedIndexUpdatesMapping (0.7% fail rate in 273 executions)

Note:
This issue was created using new test triage automation. Please report issues or feedback to es-delivery.

[elasticsearchmachine]

Pinging @elastic/ml-core (Team:ML)