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

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #8671 / 8.12.2_bwc
• elasticsearch-periodic #8665 / 8.12.2_bwc
• elasticsearch-periodic #8659 / 8.12.2_bwc
• elasticsearch-periodic #8659 / 8.11.4_bwc
• elasticsearch-periodic #8653 / 8.12.2_bwc
• elasticsearch-periodic #8653 / 8.11.4_bwc
• elasticsearch-periodic #8641 / 8.11.4_bwc
• elasticsearch-periodic #8635 / 8.11.4_bwc
• elasticsearch-periodic #8635 / 8.12.2_bwc
• elasticsearch-periodic #8629 / 8.11.4_bwc

Reproduction Line:

./gradlew ":x-pack:plugin:esql:qa:server:mixed-cluster:v8.12.2#javaRestTest" -Dtests.class="org.elasticsearch.xpack.esql.qa.mixed.MixedClusterEsqlSpecIT" -Dtests.method="test {where-like.RlikeWithLowerTurnedInsensitiveNotPushedDown SYNC}" -Dtests.seed=B370B30B28EF7DF2 -Dtests.bwc=true -Dtests.locale=ar-SA -Dtests.timezone=Asia/Chungking -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]:39041], URI [/_query?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 4:9: Unknown function [TO_LOWER], did you mean any of [to_long, to_ver, to_boolean, to_bool, to_integer, to_str, to_ulong]?",
        "stack_trace" : "org.elasticsearch.xpack.esql.analysis.VerificationException: Found 1 problem\nline 4:9: Unknown function [TO_LOWER], did you mean any of [to_long, to_ver, to_boolean, to_bool, to_integer, to_str, to_ulong]?\n\tat org.elasticsearch.xpack.esql.analysis.Analyzer.verify(Analyzer.java:120)\n\tat org.elasticsearch.xpack.esql.analysis.Analyzer.analyze(Analyzer.java:114)\n\tat org.elasticsearch.xpack.esql.session.EsqlSession.lambda$analyzedPlan$2(EsqlSession.java:145)\n\tat org.elasticsearch.x
[truncated]

Issue Reasons:

• [8.19] 4 consecutive failures in step 8.12.2_bwc
• [8.19] 17 failures in test test {where-like.LikeWithUpperTurnedInsensitive SYNC} (4.2% fail rate in 409 executions)
• [8.19] 9 failures in step 8.12.2_bwc (64.3% fail rate in 14 executions)
• [8.19] 8 failures in step 8.11.4_bwc (57.1% fail rate in 14 executions)
• [8.19] 13 failures in pipeline elasticsearch-periodic (86.7% fail rate in 15 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_UPPER was added in v 8.13