TransformIntegrationTests#testSearchTransform can fail with an assertion error

[jtibshirani]

Unfortunately the failure doesn't reproduce for me locally.

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Link to the build: https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+6.x+intake/1189

Command to reproduce:

./gradlew :x-pack:plugin:watcher:unitTest \
  -Dtests.seed=7025F52611D9E3C2 \
  -Dtests.class=org.elasticsearch.xpack.watcher.transform.TransformIntegrationTests \
  -Dtests.method="testSearchTransform" \
  -Dtests.security.manager=true \
  -Dtests.locale=el-CY \
  -Dtests.timezone=US/Michigan \
  -Dcompiler.java=11 \
  -Druntime.java=8

Relevant excerpt from the logs:

09:57:34 FAILURE 1.65s J3 | TransformIntegrationTests.testSearchTransform <<< FAILURES!
09:57:34    > Throwable #1: java.lang.AssertionError: could not find watch [_id2] to trigger
09:57:34    > Expected: is <true>
09:57:34    >      but: was <false>
09:57:34    > 	at __randomizedtesting.SeedInfo.seed([7025F52611D9E3C2:20E5361838A201DD]:0)
09:57:34    > 	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
09:57:34    > 	at org.elasticsearch.xpack.watcher.test.AbstractWatcherIntegrationTestCase$TimeWarp.trigger(AbstractWatcherIntegrationTestCase.java:569)
09:57:34    > 	at org.elasticsearch.xpack.watcher.test.AbstractWatcherIntegrationTestCase$TimeWarp.trigger(AbstractWatcherIntegrationTestCase.java:559)
09:57:34    > 	at org.elasticsearch.xpack.watcher.transform.TransformIntegrationTests.testSearchTransform(TransformIntegrationTests.java:186)
09:57:34    > 	at java.lang.Thread.run(Thread.java:748)

[elasticmachine]

Pinging @elastic/es-core-features

[jtibshirani]

Since this test has failed several times in the past month, I muted it in 455f223.

[jtibshirani]

I wasn't able to make progress debugging this locally, so I unmuted the test and enabled logging on master and 7.x.