[CI] LinearRankClientYamlTestSuiteIT test {yaml=linear/10_linear_retriever/should normalize initial scores with l2_norm} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #8539 / concurrent-search-tests
• elasticsearch-periodic-platform-support #8556 / rhel-8_platform-support-unix
• elasticsearch-periodic-platform-support #8556 / debian-12_platform-support-unix
• elasticsearch-periodic-platform-support #8556 / sles-15_platform-support-unix
• elasticsearch-periodic-platform-support #8556 / almalinux-9_platform-support-unix
• elasticsearch-periodic-platform-support #8556 / opensuse-leap-15_platform-support-unix
• elasticsearch-periodic-platform-support #8556 / rocky-8_platform-support-unix
• elasticsearch-periodic-platform-support #8556 / windows-2025_checkpart2_platform-support-windows
• elasticsearch-periodic-platform-support #8556 / windows-2022_checkpart2_platform-support-windows
• elasticsearch-periodic #8539 / openjdk21_checkpart2_java-matrix

Reproduction Line:

./gradlew ":x-pack:plugin:rank-rrf:yamlRestTest" --tests "org.elasticsearch.xpack.rank.rrf.LinearRankClientYamlTestSuiteIT.test {yaml=linear/10_linear_retriever/should normalize initial scores with l2_norm}" -Dtests.seed=B392F52F3B06DCB1 -Dtests.jvm.argline="-Des.concurrent_search=true" -Dtests.locale=en-MS -Dtests.timezone=ECT -Druntime.java=24

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Failure at [linear/10_linear_retriever:319]: field [hits.hits.3._score] doesn't match the expected value
Expected: <1.2>
     but: was <1.2000000476837158>

Issue Reasons:

• [main] 7 consecutive failures in test test {yaml=linear/10_linear_retriever/should normalize initial scores with l2_norm}
• [main] 19 failures in test test {yaml=linear/10_linear_retriever/should normalize initial scores with l2_norm} (73.1% fail rate in 26 executions)
• [main] 4 failures in step part2 (57.1% fail rate in 7 executions)
• [main] 4 failures in pipeline elasticsearch-intake (57.1% fail rate in 7 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] 3 consecutive failures in test test {yaml=linear/10_linear_retriever/should normalize initial scores with l2_norm}
• [main] 2 consecutive failures in step part2
• [main] 2 consecutive failures in pipeline elasticsearch-intake
• [main] 3 failures in test test {yaml=linear/10_linear_retriever/should normalize initial scores with l2_norm} (60.0% fail rate in 5 executions)
• [main] 2 failures in step part2 (66.7% fail rate in 3 executions)
• [main] 2 failures in pipeline elasticsearch-intake (66.7% fail rate in 3 executions)

Build Scans:

• elasticsearch-intake #23490 / part2
• elasticsearch-pull-request #73466 / part-2
• elasticsearch-intake #23481 / part2

[elasticsearchmachine]

Pinging @elastic/es-search-relevance (Team:Search Relevance)