[CI] FieldSortIT testSortMixedFieldTypes failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #8758 / oraclelinux-9_platform-support-unix
• elasticsearch-intake #23870 / part1

Reproduction Line:

./gradlew ":server:internalClusterTest" --tests "org.elasticsearch.search.sort.FieldSortIT.testSortMixedFieldTypes" -Dtests.seed=F6995E804508C6C3 -Dtests.locale=dsb -Dtests.timezone=Africa/Asmera -Druntime.java=24

Applicable branches: 8.19

Reproduces locally?: N/A

Failure History: See dashboard

Failure Message:

java.lang.AssertionError: invalid decRef call: already closed

Issue Reasons:

• [8.19] 2 failures in test testSortMixedFieldTypes (0.6% fail rate in 335 executions)

Note: This issue was created using new test triage automation. Please report issues or feedback to es-delivery.