[CI] FlushIT#testSyncedFlushSkipOutOfSyncReplicas failure

[davidkyle]

The error is:

java.lang.AssertionError: 
Expected: <2>
     but: was <0>
	at __randomizedtesting.SeedInfo.seed([A4109CF51649FE21:7ADE9ABED536E726]:0)
	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
	at org.junit.Assert.assertThat(Assert.java:956)
	at org.junit.Assert.assertThat(Assert.java:923)
	at org.elasticsearch.indices.flush.FlushIT.testSyncedFlushSkipOutOfSyncReplicas(FlushIT.java:281)

Does not reproduce:

./gradlew :server:integTest \
  -Dtests.seed=A4109CF51649FE21 \
  -Dtests.class=org.elasticsearch.indices.flush.FlushIT \
  -Dtests.method="testSyncedFlushSkipOutOfSyncReplicas" \
  -Dtests.security.manager=true \
  -Dtests.locale=en-AU \
  -Dtests.timezone=Asia/Macau

https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+6.x+multijob-unix-compatibility/os=opensuse/884/console

[elasticmachine]

Pinging @elastic/es-core-infra

[elasticmachine]

Pinging @elastic/es-distributed

[dnhatn]

CI Log: testSyncedFlushSkipOutOfSyncReplicas.txt

[bleskes]

@dnhatn did you get anywhere with this?

[dnhatn]

A similar instance testDoNotRenewSyncedFlushWhenAllSealed.txt

https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+multijob-unix-compatibility/os=oraclelinux/2323/console

[dnhatn]

@bleskes I will be looking at this tomorrow.

[jkakavas]

Another instance of this today

FAILURE 0.99s J0 | FlushIT.testDoNotRenewSyncedFlushWhenAllSealed <<< FAILURES!
10:53:05    > Throwable #1: java.lang.AssertionError: 
10:53:05    > Expected: <3>
10:53:05    >      but: was <0>
10:53:05    > 	at __randomizedtesting.SeedInfo.seed([B2D1D0AA1E7F53C3:EFEE892888111141]:0)
10:53:05    > 	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
10:53:05    > 	at org.elasticsearch.indices.flush.FlushIT.testDoNotRenewSyncedFlushWhenAllSealed(FlushIT.java:313)
10:53:05    > 	at java.lang.Thread.run(Thread.java:748)

https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+multijob-windows-compatibility/1565/consoleFull