[CI] StatsAggregatorTests.testSummationAccuracy failure

[henningandersen]

Build scan:

https://gradle-enterprise.elastic.co/s/voerxtqazihqa

Repro line:

./gradlew ':server:test' --tests "org.elasticsearch.search.aggregations.metrics.StatsAggregatorTests.testSummationAccuracy"   -Dtests.seed=4772739B26F93342   -Dtests.security.manager=true   -Dtests.locale=ms-MY   -Dtests.timezone=Europe/Skopje   -Druntime.java=8

Reproduces locally?:
Yes, using above and in IntelliJ, using same seed.

Applicable branches:

Failure history:
It has failed once in master and once in 7.x in the last couple of days.

Failure excerpt:

java.lang.AssertionError: expected:<0.9> but was:<0.8999999999999999>
        at __randomizedtesting.SeedInfo.seed([4772739B26F93342:1EBB81430D65ED31]:0)
        at org.junit.Assert.fail(Assert.java:88)
        at org.junit.Assert.failNotEquals(Assert.java:834)
        at org.junit.Assert.assertEquals(Assert.java:553)
        at org.junit.Assert.assertEquals(Assert.java:683)
        at org.elasticsearch.search.aggregations.metrics.StatsAggregatorTests.lambda$verifySummationOfDoubles$6(StatsAggregatorTests.java:192)
        at org.elasticsearch.search.aggregations.metrics.StatsAggregatorTests.testCase(StatsAggregatorTests.java:438)
        at org.elasticsearch.search.aggregations.metrics.StatsAggregatorTests.verifySummationOfDoubles(StatsAggregatorTests.java:183)
        at org.elasticsearch.search.aggregations.metrics.StatsAggregatorTests.testSummationAccuracy(StatsAggregatorTests.java:143)

[elasticmachine]

Pinging @elastic/es-analytics-geo (:Analytics/Aggregations)

[nik9000]

I have a fix for this locally and I'll push tomorrow when I can be around after pushing.