GrokTests unit tests fail with "Unable to find pattern [] in Grok's pattern dictionary" #43673
Description
Example build failure
https://scans.gradle.com/s/iepue6nvnpjco/tests/vmr3zh2fll5n6-jtrpes23gv6dm
Reproduction line
does not reproduce locally
./gradlew :libs:elasticsearch-grok:test --tests "org.elasticsearch.grok.GrokTests.testDatePattern" -Dtests.seed=7783EF4A23023948 -Dtests.security.manager=true -Dtests.locale=fur -Dtests.timezone=Europe/Kiev -Dcompiler.java=12 -Druntime.java=12
HomeTestsGrokTests » testDatePatternClose test output (esc)
Example relevant log:
java.lang.IllegalArgumentException: Unable to find pattern [] in Grok's pattern dictionary
Frequency
reproduces ~ 6 times in the past 30 days
/cc @talevy
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