[CI] MultiClusterSpecIT test {date.Convert no zone} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #7878 / 8.13.4_bwc
• elasticsearch-periodic #7860 / 8.13.4_bwc

Reproduction Line:

./gradlew ":x-pack:plugin:esql:qa:server:multi-clusters:v8.13.4#oldToNew" -Dtests.class="org.elasticsearch.xpack.esql.ccq.MultiClusterSpecIT" -Dtests.method="test {date.Convert no zone}" -Dtests.seed=11C2B69FAD063454 -Dtests.bwc=true -Dtests.locale=he-Hebr-IL -Dtests.timezone=Asia/Gaza -Druntime.java=24

Applicable branches:
8.19

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Expected an empty list
0: <unexpected> but was "Line 2:13: evaluation of [TO_DATETIME(str)] failed, treating result as null. Only first 20 failures recorded."
1: <unexpected> but was "Line 2:13: java.lang.IllegalArgumentException: failed to parse date field [2025-04-11T05:00:00.000] with format [yyyy-MM-dd'T'HH:mm:ss.SSS'Z']"

Issue Reasons:

• [8.19] 2 failures in test test {date.Convert no zone} (0.9% fail rate in 231 executions)
• [8.19] 2 failures in step 8.13.4_bwc (50.0% fail rate in 4 executions)
• [8.19] 2 failures in pipeline elasticsearch-periodic (50.0% fail rate in 4 executions)

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

[elasticsearchmachine]

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