[ML] ML BWC tests cannot run against pre-ML versions #37136
Merged
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This was spotted in the CI failure https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+6.x+bwc-tests/241/console
The error is clear from the reproduce line
REPRODUCE WITH: ./gradlew :x-pack:qa:full-cluster-restart:with-system-key:v5.0.0#oldClusterTestRunner ...ML did not exist in v5.0.0.
This change prevents the full cluster restart tests running against versions prior to v5.5.0. ML was first introduced in v5.4.0 but we do not support opening v5.4.0 jobs