[CI] DiscoveryDisruptionIT testNodeNotReachableFromMaster failing

[DaveCTurner]

Apparently started failing yesterday, so I suspect #77295.

Build scan:
https://gradle-enterprise.elastic.co/s/stvsd3hldftkw/tests/:server:internalClusterTest/org.elasticsearch.discovery.DiscoveryDisruptionIT/testNodeNotReachableFromMaster

Reproduction line:
./gradlew ':server:internalClusterTest' --tests "org.elasticsearch.discovery.DiscoveryDisruptionIT.testNodeNotReachableFromMaster" -Dtests.seed=9F7C9ACE9C5372A6 -Dtests.locale=es-CR -Dtests.timezone=Antarctica/Palmer -Druntime.java=8

Applicable branches:
master, 7.x

Reproduces locally?:
Yes (after ~100 iterations on a machine under other CPU stress at least)

Failure history:
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.discovery.DiscoveryDisruptionIT&tests.test=testNodeNotReachableFromMaster

Failure excerpt:

java.lang.AssertionError: failed to reach a stable cluster of [3] nodes. Tried via [node_t2]. last cluster state:
cluster uuid: UrR8p3NCSxG7X7O6RuU1Ew [committed: true]
version: 5
state uuid: RoiNdlNVSw-qLwqAlq09hw
from_diff: false
meta data version: 2
   coordination_metadata:
      term: 1
      last_committed_config: VotingConfiguration{K0NNaGVjQ9222NU6pSwv0w,nd09eEyhSHawwbhdCoUDhQ,etiVADfmS7uwEkaOQIMJTw}
      last_accepted_config: VotingConfiguration{K0NNaGVjQ9222NU6pSwv0w,nd09eEyhSHawwbhdCoUDhQ,etiVADfmS7uwEkaOQIMJTw}
      voting tombstones: []
metadata customs:
   index-graveyard: IndexGraveyard[[]]
nodes: 
   {node_t1}{K0NNaGVjQ9222NU6pSwv0w}{izTy7ND2S9-DeSa9k6Nsmg}{127.0.0.1}{127.0.0.1:33239}{cdfhimrsw}, master
   {node_t2}{nd09eEyhSHawwbhdCoUDhQ}{qcuDm2VeR42tIPcR1f2yHQ}{127.0.0.1}{127.0.0.1:43767}{cdfhimrsw}
routing_table (version 1):
routing_nodes:
-----node_id[nd09eEyhSHawwbhdCoUDhQ][V]
-----node_id[K0NNaGVjQ9222NU6pSwv0w][V]
---- unassigned

  at org.junit.Assert.fail(Assert.java:88)
  at org.elasticsearch.test.ESIntegTestCase.ensureStableCluster(ESIntegTestCase.java:1294)
  at org.elasticsearch.test.ESIntegTestCase.ensureStableCluster(ESIntegTestCase.java:1273)
  at org.elasticsearch.test.ESIntegTestCase.ensureStableCluster(ESIntegTestCase.java:1269)
  at org.elasticsearch.discovery.DiscoveryDisruptionIT.testNodeNotReachableFromMaster(DiscoveryDisruptionIT.java:203)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-2)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1750)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:938)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:974)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:988)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:49)
  at org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
  at org.apache.lucene.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:48)
  at org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)
  at org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:368)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:817)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:468)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:947)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:832)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:883)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:894)
  at org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:41)
  at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
  at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
  at org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)
  at org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)
  at org.apache.lucene.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:54)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:368)
  at java.lang.Thread.run(Thread.java:748)

[elasticmachine]

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