FullClusterRestartIT can fail if the "old" cluster is v7.0.0

[jakelandis]

The following are reproducible. The logic in the tests need to be updated to handle when a v7.0.0 can be the "old" cluster.

Execution failed for task ':qa:full-cluster-restart:v7.0.0#oldClusterTestRunner'.

    REPRODUCE WITH: ./gradlew :qa:full-cluster-restart:v7.0.0#oldClusterTestRunner --tests "org.elasticsearch.upgrades.FullClusterRestartIT.testShrinkAfterUpgrade" \
  -Dtests.seed=B4AB35F1F1DF958D \
  -Dtests.security.manager=true \
  -Dtests.locale=sl-SI \
  -Dtests.timezone=America/Miquelon \
  -Dtests.distribution=default \
  -Dcompiler.java=12 \
  -Druntime.java=8

    REPRODUCE WITH: ./gradlew :qa:full-cluster-restart:v7.0.0#oldClusterTestRunner --tests "org.elasticsearch.upgrades.FullClusterRestartIT.testRecovery" \
  -Dtests.seed=B4AB35F1F1DF958D \
  -Dtests.security.manager=true \
  -Dtests.locale=sl-SI \
  -Dtests.timezone=America/Miquelon \
  -Dtests.distribution=default \
  -Dcompiler.java=12 \
  -Druntime.java=8

REPRODUCE WITH: ./gradlew :qa:full-cluster-restart:v7.0.0#oldClusterTestRunner --tests "org.elasticsearch.upgrades.FullClusterRestartIT.testShrinkAfterUpgrade" \
  -Dtests.seed=B4AB35F1F1DF958D \
  -Dtests.security.manager=true \
  -Dtests.locale=sl-SI \
  -Dtests.timezone=America/Miquelon \
  -Dtests.distribution=default \
  -Dcompiler.java=12 \
  -Druntime.java=8

    REPRODUCE WITH: ./gradlew :qa:full-cluster-restart:v7.0.0#oldClusterTestRunner --tests "org.elasticsearch.upgrades.FullClusterRestartIT.testSoftDeletes" \
  -Dtests.seed=B4AB35F1F1DF958D \
  -Dtests.security.manager=true \
  -Dtests.locale=sl-SI \
  -Dtests.timezone=America/Miquelon \
  -Dtests.distribution=default \
  -Dcompiler.java=12 \
  -Druntime.java=8

REPRODUCE WITH: ./gradlew :qa:full-cluster-restart:v7.0.0#oldClusterTestRunner --tests "org.elasticsearch.upgrades.FullClusterRestartIT.testRecovery" \
  -Dtests.seed=B4AB35F1F1DF958D \
  -Dtests.security.manager=true \
  -Dtests.locale=sl-SI \
  -Dtests.timezone=America/Miquelon \
  -Dtests.distribution=default \
  -Dcompiler.java=12 \
  -Druntime.java=8

    REPRODUCE WITH: ./gradlew :qa:full-cluster-restart:v7.0.0#oldClusterTestRunner --tests "org.elasticsearch.upgrades.FullClusterRestartIT.testNewReplicasWork" \
  -Dtests.seed=B4AB35F1F1DF958D \
  -Dtests.security.manager=true \
  -Dtests.locale=sl-SI \
  -Dtests.timezone=America/Miquelon \
  -Dtests.distribution=default \
  -Dcompiler.java=12 \
  -Druntime.java=8

REPRODUCE WITH: ./gradlew :qa:full-cluster-restart:v7.0.0#oldClusterTestRunner --tests "org.elasticsearch.upgrades.FullClusterRestartIT.testSoftDeletes" \
  -Dtests.seed=B4AB35F1F1DF958D \
  -Dtests.security.manager=true \
  -Dtests.locale=sl-SI \
  -Dtests.timezone=America/Miquelon \
  -Dtests.distribution=default \
  -Dcompiler.java=12 \
  -Druntime.java=8

    REPRODUCE WITH: ./gradlew :qa:full-cluster-restart:v7.0.0#oldClusterTestRunner --tests "org.elasticsearch.upgrades.FullClusterRestartIT.testShrink" \
  -Dtests.seed=B4AB35F1F1DF958D \
  -Dtests.security.manager=true \
  -Dtests.locale=sl-SI \
  -Dtests.timezone=America/Miquelon \
  -Dtests.distribution=default \
  -Dcompiler.java=12 \
  -Druntime.java=8

REPRODUCE WITH: ./gradlew :qa:full-cluster-restart:v7.0.0#oldClusterTestRunner --tests "org.elasticsearch.upgrades.FullClusterRestartIT.testNewReplicasWork" \
  -Dtests.seed=B4AB35F1F1DF958D \
  -Dtests.security.manager=true \
  -Dtests.locale=sl-SI \
  -Dtests.timezone=America/Miquelon \
  -Dtests.distribution=default \
  -Dcompiler.java=12 \
  -Druntime.java=8

    REPRODUCE WITH: ./gradlew :qa:full-cluster-restart:v7.0.0#oldClusterTestRunner --tests "org.elasticsearch.upgrades.FullClusterRestartIT.testSingleDoc" \
  -Dtests.seed=B4AB35F1F1DF958D \
  -Dtests.security.manager=true \
  -Dtests.locale=sl-SI \
  -Dtests.timezone=America/Miquelon \
  -Dtests.distribution=default \
  -Dcompiler.java=12 \
  -Druntime.java=8

[elasticmachine]

Pinging @elastic/es-core-infra

[rjernst]

This was fixed by #41269