[CI] SignificantTextAggregatorTests::testSignificanceOnTextArrays Failure

[davidkyle]

This one is reproducible

gradle :core:test -Dtests.seed=2221EA16B47141CE -Dtests.class=org.elasticsearch.search.aggregations.bucket.significant.SignificantTextAggregatorTests -Dtests.method="testSignificanceOnTextArrays" -Dtests.security.manager=true -Dtests.locale=hr-HR -Dtests.timezone=America/Fortaleza

https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+periodic/3190/console