Build Scans:

• elasticsearch-intake #36973 / part3
• elasticsearch-pull-request #134396 / part-3

Reproduction Line:

./gradlew ":x-pack:plugin:esql:test" --tests "org.elasticsearch.xpack.esql.tree.EsqlNodeSubclassTests" -Dtests.method="testTransform {class org.elasticsearch.xpack.esql.plan.physical.MergeExec}" -Dtests.seed=1D702DA1BB5EDD0E -Dtests.locale=zh-Hant-HK -Dtests.timezone=Asia/Thimphu -Druntime.java=25

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: output() called on unresolved plan

Issue Reasons:

• [main] 1 consecutive failures in test testTransform {class org.elasticsearch.xpack.esql.plan.physical.MergeExec}
• [main] 1 consecutive failures in step part3
• [main] 1 consecutive failures in pipeline elasticsearch-intake
• [main] 2 failures in test testTransform {class org.elasticsearch.xpack.esql.plan.physical.MergeExec} (0.4% fail rate in 450 executions)

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