[CI] MixedClusterEsqlSpecIT test {where-like.NegatedRLikeWithLowerTurnedInsensitive SYNC} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #8623 / 8.11.4_bwc
• elasticsearch-periodic #8623 / 8.12.2_bwc
• elasticsearch-periodic #8617 / 8.12.2_bwc
• elasticsearch-periodic #8617 / 8.11.4_bwc
• elasticsearch-periodic #8611 / 8.12.2_bwc
• elasticsearch-periodic #8611 / 8.11.4_bwc
• elasticsearch-periodic #8604 / 8.11.4_bwc
• elasticsearch-periodic #8598 / 8.12.2_bwc
• elasticsearch-periodic #8585 / 8.11.4_bwc

Reproduction Line:

./gradlew ":x-pack:plugin:esql:qa:server:mixed-cluster:v8.11.4#javaRestTest" -Dtests.class="org.elasticsearch.xpack.esql.qa.mixed.MixedClusterEsqlSpecIT" -Dtests.method="test {where-like.NegatedRLikeWithLowerTurnedInsensitive SYNC}" -Dtests.seed=158010DEB26CF17F -Dtests.bwc=true -Dtests.locale=da-GL -Dtests.timezone=Europe/Madrid -Druntime.java=24

Applicable branches:
8.19

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

org.elasticsearch.client.ResponseException: method [POST], host [http://[::1]:37261], URI [/_query?format=yaml&pretty=true&error_trace=true], status line [HTTP/1.1 400 Bad Request]
Warnings: [No limit defined, adding default limit of [500]]
---
error:
  root_cause:
  - type: "verification_exception"
    reason: "Found 1 problem\nline 4:18: Unknown function [TO_UPPER], did you mean\
      \ any of [to_ver, to_integer, to_ip, to_str, to_ulong, to_ul]?"
    stack_trace: "org.elasticsearch.xpack.esql.analysis.VerificationException: Found\
      \ 1 problem\nline 4:18: Unknown function [TO_UPPER], did you mean any of [to_ver,\
      \ to_integer, to_ip, to_str, to_ulong, to_ul]?\n\tat org.elasticsearch.xpack.esql.analysis.Analyzer.verify(Analyzer.java:113)\n\
      \tat org.elasticsearch.xpack.esql.analysis.Analyzer.analyze(Analyzer.java:107)\n\
      \tat org.elasticsearch.xpack.esql.session.EsqlSession.lambda$analyzedPlan$2(EsqlSession.java:143)\n\
      \tat org.elasticsearch.xpack.esql.
[truncated]

Issue Reasons:

• [8.19] 2 consecutive failures in test test {where-like.NegatedRLikeWithLowerTurnedInsensitive SYNC}
• [8.19] 4 consecutive failures in step 8.11.4_bwc
• [8.19] 3 consecutive failures in step 8.12.2_bwc
• [8.19] 9 failures in test test {where-like.NegatedRLikeWithLowerTurnedInsensitive SYNC} (4.1% fail rate in 218 executions)
• [8.19] 5 failures in step 8.11.4_bwc (71.4% fail rate in 7 executions)
• [8.19] 4 failures in step 8.12.2_bwc (66.7% fail rate in 6 executions)
• [8.19] 6 failures in pipeline elasticsearch-periodic (85.7% fail rate in 7 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)

[luigidellaquila]

This just needs to be excluded in v 8.11-12: TO_LOWER was added in v 8.13