[CI] InnerHitsIT suite fails

[dnhatn]

This test suite starts failing after we integrated soft-deletes into Elasticsearch.

I cannot reproduce locally with this command:

./gradlew :server:integTest \
  -Dtests.seed=2A48E284B121F3B \
  -Dtests.class=org.elasticsearch.search.fetch.subphase.InnerHitsIT \
  -Dtests.method="testRandomNested" \
  -Dtests.security.manager=true \
  -Dtests.locale=it-CH \
  -Dtests.timezone=SystemV/MST7MDT \
  -Dcompiler.java=10 \
  -Druntime.java=8

CI instances:

• https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+intake/2656/console
• https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+intake/2654/console

[elasticmachine]

Pinging @elastic/es-distributed