SearchableSnapshotsIntegTests.testCreateAndRestoreSearchableSnapshot fails in CI

[jaymode]

Build scan: https://gradle-enterprise.elastic.co/s/cnsrpr3fujj2q
https://gradle-enterprise.elastic.co/s/n5hmbbxldsuhk
https://gradle-enterprise.elastic.co/s/gscvjrekywe3q
https://gradle-enterprise.elastic.co/s/dzrw3ffl4j4cm
https://gradle-enterprise.elastic.co/s/ibvtawsdhfygg

Repro line:

./gradlew ':x-pack:plugin:searchable-snapshots:test' --tests "org.elasticsearch.xpack.searchablesnapshots.SearchableSnapshotsIntegTests.testCreateAndRestoreSearchableSnapshot" -Dtests.seed=1AF5653F79457015 -Dtests.security.manager=true -Dtests.locale=th -Dtests.timezone=Asia/Shanghai -Druntime.java=8

Reproduces locally?: No

Applicable branches: 7.x, master

Failure excerpt:

org.elasticsearch.xpack.searchablesnapshots.SearchableSnapshotsIntegTests > testCreateAndRestoreSearchableSnapshot FAILED
    java.lang.AssertionError: 
    Expected: <8>
         but: was <10>
        at __randomizedtesting.SeedInfo.seed([1AF5653F79457015:90961244EAD221A6]:0)
        at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
        at org.junit.Assert.assertThat(Assert.java:956)
        at org.junit.Assert.assertThat(Assert.java:923)
        at org.elasticsearch.xpack.searchablesnapshots.SearchableSnapshotsIntegTests.assertRecoveryStats(SearchableSnapshotsIntegTests.java:706)
        at org.elasticsearch.xpack.searchablesnapshots.SearchableSnapshotsIntegTests.testCreateAndRestoreSearchableSnapshot(SearchableSnapshotsIntegTests.java:234)

[elasticmachine]

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