[CI] AssertionError in GoogleCloudStorageBlobContainerRetriesTests testWriteLargeBlob

[cbuescher]

Failure on 7.7: https://gradle-enterprise.elastic.co/s/6q5voyyn7k3vc

I couldn't reproduce locally (even leavign out the -Dbuild.snapshot=false):

./gradlew ':plugins:repository-gcs:test' --tests "org.elasticsearch.repositories.gcs.GoogleCloudStorageBlobContainerRetriesTests.testWriteLargeBlob" \
  -Dtests.seed=74CA5748F999C5E9 \
  -Dtests.security.manager=true \
  -Dbuild.snapshot=false \
  -Dtests.jvm.argline="-Dbuild.snapshot=false" \
  -Dtests.locale=ca-ES \
  -Dtests.timezone=Asia/Tomsk \
  -Dcompiler.java=14

There is an AssertionError in the logs like this:

java.lang.AssertionError: 
Expected: (<15728640> or <7388234>)
     but: was <1949696>
	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18) ~[hamcrest-2.1.jar:2.1]
	at org.junit.Assert.assertThat(Assert.java:956) ~[junit-4.12.jar:4.12]
	at org.junit.Assert.assertThat(Assert.java:923) ~[junit-4.12.jar:4.12]
	at org.elasticsearch.repositories.gcs.GoogleCloudStorageBlobContainerRetriesTests.lambda$testWriteLargeBlob$12(GoogleCloudStorageBlobContainerRetriesTests.java:411) ~[test/:?]
	at org.elasticsearch.repositories.blobstore.ESMockAPIBasedRepositoryIntegTestCase.lambda$wrap$4(ESMockAPIBasedRepositoryIntegTestCase.java:238) ~[framework-7.7.0.jar:7.7.0]
	at org.elasticsearch.repositories.gcs.GoogleCloudStorageBlobContainerRetriesTests.lambda$safeHandler$13(GoogleCloudStorageBlobContainerRetriesTests.java:452) ~[test/:?]
	at com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79) [?:1.8.0_241]

I found #52906 but the errors in the log look different so I opted for opening a new issue, please close or continue the investigation in that one if after all the issues seem to be related.

[elasticmachine]

Pinging @elastic/es-distributed (:Distributed/Snapshot/Restore)

[original-brownbear]

This looks like a different issue than the JDK8 bug, I'll take a look.
Edit: I think this is just the JDK 8 issue yet again killing the HTTP connection on the mock server. Fix PR incoming to mute this on JDK8 as well.

[original-brownbear]

Closed via #55372