[CI] RetentionLeaseIT.testRetentionLeaseSyncedOnRemove fails

[jimczi]

This test fails reproducibly in 6.7:
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+6.7+internalClusterTest/404/console

REPRODUCE WITH: ./gradlew :server:integTest \
  -Dtests.seed=B1BFA31B134F4CA0 \
  -Dtests.class=org.elasticsearch.index.seqno.RetentionLeaseIT \
  -Dtests.method="testRetentionLeaseSyncedOnRemove" \
  -Dtests.security.manager=true \
  -Dtests.locale=zh-CN \
  -Dtests.timezone=Europe/Skopje \
  -Dcompiler.java=11 \
  -Druntime.java=8

The same test is working fine in master and 7x.

[elasticmachine]

Pinging @elastic/es-distributed

[jasontedor]

Closed by 5fad38e