[CI] data_frame/transforms_start_stop/Test start/stop/start transform failed

[droberts195]

org.elasticsearch.xpack.test.rest.XPackRestIT test {p0=transform/transforms_start_stop/Test start/stop only starts/stops specified transform} failed in https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+matrix-java-periodic/ES_BUILD_JAVA=openjdk12,ES_RUNTIME_JAVA=zulu11,nodes=general-purpose/240/console (scan https://gradle-enterprise.elastic.co/s/5ue2zwsinn5fi)

The error was:

  2> java.lang.AssertionError: Failure at [transform/transforms_start_stop:276]: field [transforms.0.state] was expected to match the provided regex but didn't
    Expected: started|indexing
         but: was "stopped"

        Caused by:
        java.lang.AssertionError: field [transforms.0.state] was expected to match the provided regex but didn't
        Expected: started|indexing
             but: was "stopped"

This doesn't reproduce consistently with:

./gradlew ':x-pack:plugin:integTestRunner' --tests "org.elasticsearch.xpack.test.rest.XPackRestIT.test {p0=transform/transforms_start_stop/Test start/stop only starts/stops specified transform}" \
  -Dtests.seed=89EE627200B8B896 \
  -Dtests.security.manager=true \
  -Dtests.locale=gu-IN \
  -Dtests.timezone=Africa/Accra \
  -Dcompiler.java=12 \
  -Druntime.java=11 \
  -Dtests.rest.blacklist=getting_started/10_monitor_cluster_health/*

[elasticmachine]

Pinging @elastic/ml-core (:ml/Transforms)

[droberts195]

The same thing also happened yesterday in https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+matrix-java-periodic/ES_BUILD_JAVA=openjdk12,ES_RUNTIME_JAVA=corretto11,nodes=general-purpose/238/consoleText