Mute org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT #119806

Author: elasticsearchmachine

muted-tests.yml

@@ -450,3 +450,5 @@ tests:
 - class: org.elasticsearch.xpack.migrate.action.ReindexDatastreamIndexTransportActionIT
   method: testTsdbStartEndSet
   issue: https://github.com/elastic/elasticsearch/issues/120314
+- class: org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT
+  issue: https://github.com/elastic/elasticsearch/issues/119806