[CI] IncrementalBulkIT testMultipleBulkPartsWithBackoff failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #4276 / ubuntu-2204_platform-support-unix
• elasticsearch-periodic-platform-support #4276 / oraclelinux-7_platform-support-unix
• elasticsearch-periodic-platform-support #4276 / debian-11_platform-support-unix
• elasticsearch-periodic-platform-support #4276 / ubuntu-1804_platform-support-unix
• elasticsearch-periodic-platform-support #4276 / rocky-8_platform-support-unix
• elasticsearch-pull-request #34711 / part-1

Reproduction Line:

./gradlew ":server:internalClusterTest" --tests "org.elasticsearch.action.bulk.IncrementalBulkIT.testMultipleBulkPartsWithBackoff" -Dtests.seed=EE649D3DAE2BBD76 -Dtests.locale=lij-IT -Dtests.timezone=EET -Druntime.java=22

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: null

Issue Reasons:

• [main] 2 consecutive failures in test testMultipleBulkPartsWithBackoff
• [main] 6 failures in test testMultipleBulkPartsWithBackoff (3.1% fail rate in 196 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 testMultipleBulkPartsWithBackoff (1.0% fail rate in 191 executions)

Build Scans:

• elasticsearch-periodic-platform-support #4276 / rocky-8_platform-support-unix
• elasticsearch-pull-request #34711 / part-1

[elasticsearchmachine]

Pinging @elastic/es-distributed (Team:Distributed)