[CI] CsvTests test {csv-spec:stats.WeightedAvgWeightMvWarning} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #9997 / rhel-9_platform-support-unix
• elasticsearch-intake #26816 / part3

Reproduction Line:

./gradlew ":x-pack:plugin:esql:test" --tests "org.elasticsearch.xpack.esql.CsvTests" -Dtests.method="test {csv-spec:stats.WeightedAvgWeightMvWarning}" -Dtests.seed=8779E9AB88066E81 -Dtests.locale=vai-Vaii -Dtests.timezone=Australia/Adelaide -Druntime.java=24

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Expected a list containing
0: expected "Line 3:17: evaluation of [weighted_avg(salary, salary_change.int)] failed, treating result as null. Only first 20 failures recorded." but was <missing>
1: expected "Line 3:17: java.lang.IllegalArgumentException: single-value function encountered multi-value" but was <missing>

Issue Reasons:

• [main] 2 failures in test test {csv-spec:stats.WeightedAvgWeightMvWarning} (0.9% fail rate in 218 executions)

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

[elasticsearchmachine]

This has been muted on branch main

Mute Reasons:

• [main] 2 failures in test test {csv-spec:stats.WeightedAvgWeightMvWarning} (0.9% fail rate in 218 executions)

Build Scans:

• elasticsearch-periodic-platform-support #9997 / rhel-9_platform-support-unix
• elasticsearch-intake #26816 / part3

[elasticsearchmachine]

Pinging @elastic/es-analytical-engine (Team:Analytics)

[astefan]

@idegtiarenko there is a series of CsvTests failures today and I am wondering if it has anything to do with your recent PR #132728, especially this change

[idegtiarenko]

Closed by #132843