[CI] NodeConnectionsServiceTests. testConnectAndDisconnect & testOnlyBlocksOnConnectionsToNewNodes failed

[bizybot]

Multiple jobs failed for NodeConnectionsServiceTests#testConnectAndDisconnect & NodeConnectionsServiceTests#testOnlyBlocksOnConnectionsToNewNodes tests.

https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+g1gc/445/console
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+7.x+matrix-java-periodic/ES_BUILD_JAVA=java11,ES_RUNTIME_JAVA=zulu8,nodes=immutable&&linux&&docker/72/console
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+7.x+matrix-java-periodic/ES_BUILD_JAVA=openjdk12,ES_RUNTIME_JAVA=java11,nodes=immutable&&linux&&docker/72/console

Tried to reproduce locally but it did not with following command:

./gradlew :server:unitTest \
  -Dtests.seed=8231EE33CCE16B45 \
  -Dtests.class=org.elasticsearch.cluster.NodeConnectionsServiceTests \
  -Dtests.method="testConnectAndDisconnect" \
  -Dtests.security.manager=true \
  -Dtests.jvm.argline="-XX:-UseConcMarkSweepGC -XX:+UseG1GC" \
  -Dtests.locale=pt-BR \
  -Dtests.timezone=Pacific/Pohnpei \
  -Dcompiler.java=11 \
  -Druntime.java=8

./gradlew :server:unitTest \
  -Dtests.seed=8231EE33CCE16B45 \
  -Dtests.class=org.elasticsearch.cluster.NodeConnectionsServiceTests \
  -Dtests.security.manager=true \
  -Dtests.jvm.argline="-XX:-UseConcMarkSweepGC -XX:+UseG1GC" \
  -Dtests.locale=en-US \
  -Dtests.timezone=Etc/UTC \
  -Dcompiler.java=11 \
  -Druntime.java=8

[elasticmachine]

Pinging @elastic/es-distributed