Mute org.elasticsearch.xpack.ml.integration.ClassificationIT testStopAndRestart elastic#121433

Author: elasticsearchmachine

muted-tests.yml

@@ -518,3 +518,6 @@ tests:
 - class: org.elasticsearch.xpack.inference.action.TransportInferenceActionTests
   method: testRerouting_ToOtherNode
   issue: https://github.com/elastic/elasticsearch/issues/121293
+- class: org.elasticsearch.xpack.ml.integration.ClassificationIT
+  method: testStopAndRestart
+  issue: https://github.com/elastic/elasticsearch/issues/121433