RemoteClusterConnectionTests#testConnectedNodesConcurrentAccess fails

[jimczi]

The test fails on CI and locally with the following in master:

./gradlew ':server:test' --tests "org.elasticsearch.transport.RemoteClusterConnectionTests.testConnectedNodesConcurrentAccess" -Dtests.seed=5DC7FA5D13FE3F86 -Dtests.security.manager=true -Dtests.locale=hu-HU -Dtests.timezone=Africa/Nouakchott -Dcompiler.java=12

[elasticmachine]

Pinging @elastic/es-distributed (:Distributed/Network)