ActiveDirectoryRealmTests#testUnauthenticatedLookupWithConnectionPool failed to find user

[DaveCTurner]

Build scan: https://gradle-enterprise.elastic.co/s/tw7kq5un6sjus

Repro line: REPRODUCE WITH: ./gradlew ':x-pack:plugin:security:test' --tests "org.elasticsearch.xpack.security.authc.ldap.ActiveDirectoryRealmTests.testUnauthenticatedLookupWithConnectionPool" -Dtests.seed=C166C47928FCFF84 -Dtests.security.manager=true -Dtests.locale=hi -Dtests.timezone=America/Toronto -Druntime.java=8

Reproduces locally?: No, not after a few iterations.

Applicable branches: Only seen in 7.x.

Failure history: The only such failure in many months.

Failure excerpt:

Suite: Test class org.elasticsearch.xpack.security.authc.ldap.ActiveDirectoryRealmTests
  1> [2021-03-02T07:10:15,872][INFO ][o.e.x.s.a.l.ActiveDirectoryRealmTests] [testUnauthenticatedLookupWithConnectionPool] before test
  1> [2021-03-02T07:10:16,461][WARN ][o.e.x.s.a.s.DnRoleMapper ] [testUnauthenticatedLookupWithConnectionPool] Role mapping file [/private/var/lib/jenkins/workspace/elastic+elasticsearch+7.x+multijob-darwin-compatibility/x-pack/plugin/security/build/testrun/test/temp/org.elasticsearch.xpack.security.authc.ldap.ActiveDirectoryRealmTests_C166C47928FCFF84-001/tempDir-002/config/role_mapping.yml] for realm [testunauthenticatedlookupwithconnectionpool] does not exist. Role mapping will be skipped.
  1> [2021-03-02T07:10:21,681][INFO ][o.e.x.s.a.l.ActiveDirectoryRealmTests] [testUnauthenticatedLookupWithConnectionPool] after test
  2> REPRODUCE WITH: ./gradlew ':x-pack:plugin:security:test' --tests "org.elasticsearch.xpack.security.authc.ldap.ActiveDirectoryRealmTests.testUnauthenticatedLookupWithConnectionPool" -Dtests.seed=C166C47928FCFF84 -Dtests.security.manager=true -Dtests.locale=hi -Dtests.timezone=America/Toronto -Druntime.java=8
  2> java.lang.AssertionError: 
    Expected: not null
         but: was null
        at __randomizedtesting.SeedInfo.seed([C166C47928FCFF84:49682346750AAACF]:0)
        at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
        at org.junit.Assert.assertThat(Assert.java:956)
        at org.junit.Assert.assertThat(Assert.java:923)
        at org.elasticsearch.xpack.security.authc.ldap.ActiveDirectoryRealmTests.doUnauthenticatedLookup(ActiveDirectoryRealmTests.java:330)
        at org.elasticsearch.xpack.security.authc.ldap.ActiveDirectoryRealmTests.testUnauthenticatedLookupWithConnectionPool(ActiveDirectoryRealmTests.java:299)

[elasticmachine]

Pinging @elastic/es-security (Team:Security)

[slobodanadamovic]

I could not reproduce this one. It seems that it did not happen since it was reported. This might be because darwin CI jobs have been removed due to constant failures.