[CI] IndexActionTests.testIndexActionExecuteSingleDoc Fails

[Tim-Brooks]

2> REPRODUCE WITH: ./gradlew :x-pack:plugin:watcher:unitTest -Dtests.seed=CEACAAD7B7542031 -Dtests.class=org.elasticsearch.xpack.watcher.actions.index.IndexActionTests -Dtests.method="testIndexActionExecuteSingleDoc" -Dtests.security.manager=true -Dtests.locale=es-419 -Dtests.timezone=Africa/Abidjan -Dcompiler.java=11 -Druntime.java=11
FAILURE 0.05s | IndexActionTests.testIndexActionExecuteSingleDoc <<< FAILURES!

Throwable #1: java.lang.AssertionError:
Expected: map containing ["@timestamp"->"2019-02-07T17:18:30.820305Z"]
but: map was [<@timestamp=2019-02-07T17:18:30.820Z>, <foo=bar>]
at __randomizedtesting.SeedInfo.seed([CEACAAD7B7542031:7903D0E951B5DC99]:0)
at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
at org.elasticsearch.xpack.watcher.actions.index.IndexActionTests.testIndexActionExecuteSingleDoc(IndexActionTests.java:330)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at java.base/java.lang.Thread.run(Thread.java:834)

[Tim-Brooks]

It is possible that the fix for this is related to #38511.

[elasticmachine]

Pinging @elastic/es-core-features

[alpar-t]

This failed again in intake : https://elasticsearch-ci.elastic.co/view/Elasticsearch/job/elastic+elasticsearch+master+intake/1935/console

[pgomulka]

I mute that in master, 7.0 and 7.1 until fixed
From Alpar's link above

./gradlew :x-pack:plugin:watcher:unitTest -Dtests.seed=A13250D3D1AD0EE3 -Dtests.class=org.elasticsearch.xpack.watcher.actions.index.IndexActionTests -Dtests.method="testIndexActionExecuteSingleDoc" -Dtests.security.manager=true -Dtests.locale=en-IE -Dtests.timezone=America/Nassau -Dcompiler.java=11 -Druntime.java=8

to reproduce the test code has to be modified to fix the date with millis part having trailing zeros
like
2019-02-11T09:38:56.5Z vs 2019-02-11T09:38:56.500Z

 ZonedDateTime executionTime =
            DateUtils.nowWithMillisResolution(
                Clock.fixed(ZonedDateTime.of(2019,02,11,9,38,56,5,ZoneOffset.UTC).toInstant(),ZoneOffset.UTC));
        ```