CI ContextAndHeaderTransportIT. testThatGeoShapeQueryGetRequestContainsContextAndHeaders failures

[bizybot]

The test failed in:
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+7.x+matrix-java-periodic/ES_BUILD_JAVA=openjdk12,ES_RUNTIME_JAVA=java11,nodes=general-purpose/lastCompletedBuild/console

It did not fail locally for me on 7.x with the following:

./gradlew :qa:smoke-test-http:integTestRunner \
--tests "org.elasticsearch.http.ContextAndHeaderTransportIT.testThatGeoShapeQueryGetRequestContainsContextAndHeaders" \
-Dtests.seed=1AC128B9596B5928 \
-Dtests.security.manager=true \
-Dtests.locale=en-US \
-Dtests.timezone=Africa/Brazzaville \
-Dcompiler.java=12 \
-Druntime.java=11

with error:

java.lang.AssertionError: 1 channels still being tracked in HttpChannelTaskHandler while there should be none expected:<0> but was:<1>

I think this one and #45914 might be related and may be related to the changes done in #43332

Hi @javanna I am not sure if your change is related to these failures, could you please check? For now, I have created this as a separate issue. Thank you.

[elasticmachine]

Pinging @elastic/es-search