[CI] PushQueriesIT testCaseInsensitiveEquality {KEYWORD} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #8733 / single-processor-node-tests
• elasticsearch-periodic-platform-support #8748 / rocky-8_platform-support-unix
• elasticsearch-pull-request #75558 / part-3

Reproduction Line:

./gradlew ":x-pack:plugin:esql:qa:server:single-node:javaRestTest" --tests "org.elasticsearch.xpack.esql.qa.single_node.PushQueriesIT.testCaseInsensitiveEquality {KEYWORD}" -Dtests.seed=94808D8F3C6DB459 -Dtests.configure_test_clusters_with_one_processor=true -Dtests.locale=ewo-Latn-CM -Dtests.timezone=America/Santo_Domingo -Druntime.java=24

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Expected a map containing
             operator: "LuceneSourceOperator[shards = [test:0], maxPageSize = 4854, remainingDocs = 999]"
               status: a map containing
      processed_queries: a list containing
                        0: expected ("CaseInsensitiveTermQuery{test:}") but was "test:"
       processed_slices: <1> unexpected but ok
       processed_shards: <[test:0]> unexpected but ok
           total_slices: <1> unexpected but ok
              slice_max: <0> unexpected but ok
                current: <2147483647> unexpected but ok
              slice_min: <0> unexpected but ok
           rows_emitted: <1> unexpected but ok
          pages_emitted: <1> unexpected but ok
          process_nanos: <3971917> unexpected but ok
partitioning_strategies: <{test:0=SHARD}> unexpected but ok
            slice_index: <0> unexpected but ok

Issue Reasons:

• [main] 2 consecutive failures in test testCaseInsensitiveEquality {KEYWORD}
• [main] 3 failures in test testCaseInsensitiveEquality {KEYWORD} (1.9% fail rate in 155 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 testCaseInsensitiveEquality {KEYWORD} (1.3% fail rate in 154 executions)

Build Scans:

• elasticsearch-periodic-platform-support #8748 / rocky-8_platform-support-unix
• elasticsearch-pull-request #75558 / part-3

[elasticsearchmachine]

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

[alex-spies]

Also had this in 8.19 on a PR. Buildscan