Failure in SearchableSnapshotDirectoryTests.testClearCache

[danhermann]

Build scan: https://gradle-enterprise.elastic.co/s/ortf7bsvdpbzq

Repro line: ./gradlew ':x-pack:plugin:searchable-snapshots:test' --tests "org.elasticsearch.index.store.SearchableSnapshotDirectoryTests.testClearCache" -Dtests.seed=720D9DF9013086A4 -Dtests.security.manager=true -Dtests.locale=es-CR -Dtests.timezone=Asia/Ulan_Bator -Druntime.java=16 -Dtests.fips.enabled=true

Reproduces locally?: No

Applicable branches: master, 7.x, 7.12

Failure history: Seems to have started on 2/24/21. See build stats.

Failure excerpt:

java.lang.AssertionError: Number of files (0) mismatch, got : [] |  
-- | --
  | Expected: (a value greater than <0> and a value less than or equal to <5>) |  
  | but: a value greater than <0> <0> was equal to <0>


at __randomizedtesting.SeedInfo.seed([720D9DF9013086A4:BCD2A73583A3C9E4]:0) |  
-- | --
  |   | at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18) |  
  |   | at org.junit.Assert.assertThat(Assert.java:956) |  
  |   | at org.elasticsearch.index.store.SearchableSnapshotDirectoryTests.assertListOfFiles(SearchableSnapshotDirectoryTests.java:904) |  
  |   | at org.elasticsearch.index.store.SearchableSnapshotDirectoryTests.testClearCache(SearchableSnapshotDirectoryTests.java:740)

[elasticmachine]

Pinging @elastic/es-distributed (Team:Distributed)