[CI] ClusterDisruptionIT.testAckedIndexing fails with global checkpoints sync mismatch

[spinscale]

Even though there is another issue where this exact test fails, I think this is a new one, as the assertion is thrown in ESIntegTestCase.cleanUpCluster() - so not sure if related. This did not reproduce locally for me even after a hundred test runs.

Build at https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+6.x+intake/678/console

   > Throwable #1: java.lang.AssertionError: [test][0], node[9dhUaSxHQdamimAnmokazg], [R], s[STARTED], a[id=fn0K4Pw6RFC7hVING
OFrsw] global checkpoint syncs mismatch
   > Expected: <2L>
   >      but: was <5L>
   >    at __randomizedtesting.SeedInfo.seed([28739239BF9765D1:A2B226CAE3EA839A]:0)
   >    at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
   >    at org.elasticsearch.test.InternalTestCluster.lambda$assertSeqNos$9(InternalTestCluster.java:1330)
   >    at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:848)
   >    at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:822)
   >    at org.elasticsearch.test.InternalTestCluster.assertSeqNos(InternalTestCluster.java:1295)
   >    at org.elasticsearch.discovery.AbstractDisruptionTestCase.beforeIndexDeletion(AbstractDisruptionTestCase.java:104)
   >    at org.elasticsearch.test.ESIntegTestCase.afterInternal(ESIntegTestCase.java:585)
   >    at org.elasticsearch.test.ESIntegTestCase.cleanUpCluster(ESIntegTestCase.java:2199)
   >    at java.lang.Thread.run(Thread.java:748)
   >    Suppressed: java.lang.AssertionError: [test][0], node[9dhUaSxHQdamimAnmokazg], [R], s[STARTED], a[id=fn0K4Pw6RFC7hVIN
GOFrsw] global checkpoint syncs mismatch
   > Expected: <2L>
   >      but: was <5L>
   >            at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
   >            at org.elasticsearch.test.InternalTestCluster.lambda$assertSeqNos$9(InternalTestCluster.java:1330)
   >            at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:836)
   >            ... 39 more
   >    Suppressed: java.lang.AssertionError: [test][0], node[9dhUaSxHQdamimAnmokazg], [R], s[STARTED], a[id=fn0K4Pw6RFC7hVIN
GOFrsw] global checkpoint syncs mismatch
   > Expected: <2L>
   >      but: was <5L>
   >            at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
   >            at org.elasticsearch.test.InternalTestCluster.lambda$assertSeqNos$9(InternalTestCluster.java:1330)
   >            at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:836)
   >            ... 39 more
   >    Suppressed: java.lang.AssertionError: [test][0], node[9dhUaSxHQdamimAnmokazg], [R], s[STARTED], a[id=fn0K4Pw6RFC7hVIN
GOFrsw] global checkpoint syncs mismatch

[elasticmachine]

Pinging @elastic/es-distributed