[CI] DirectIOIT testDirectIOUsed failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #8568 / windows-2025_checkpart1_platform-support-windows
• elasticsearch-periodic-platform-support #8568 / windows-2022_checkpart1_platform-support-windows
• elasticsearch-periodic-platform-support #8568 / almalinux-8-aarch64_checkpart1_platform-support-arm
• elasticsearch-periodic-platform-support #8568 / ubuntu-2404-aarch64_checkpart1_platform-support-arm
• elasticsearch-periodic-platform-support #8568 / ubuntu-2004-aarch64_checkpart1_platform-support-arm
• elasticsearch-periodic #8551 / encryption-at-rest
• elasticsearch-periodic-platform-support #8568 / amazonlinux-2023_platform-support-aws
• elasticsearch-periodic-platform-support #8568 / ubuntu-2404_platform-support-unix
• elasticsearch-periodic-platform-support #8568 / rhel-9_platform-support-unix
• elasticsearch-periodic-platform-support #8568 / ubuntu-2204_platform-support-unix

Reproduction Line:

gradlew ":server:internalClusterTest" --tests "org.elasticsearch.index.store.DirectIOIT.testDirectIOUsed" -Dtests.seed=F8BB2C2DF093743C -Dtests.locale=be-BY -Dtests.timezone=America/Recife -Druntime.java=24

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Direct IO used
Expected: <0L>
     but: was <1L>

Issue Reasons:

• [main] 25 consecutive failures in test testDirectIOUsed
• [main] 2 consecutive failures in pipeline elasticsearch-pull-request
• [main] 25 failures in test testDirectIOUsed (37.9% fail rate in 66 executions)
• [main] 2 failures in pipeline elasticsearch-pull-request (100.0% fail rate in 2 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 testDirectIOUsed
• [main] 2 consecutive failures in pipeline elasticsearch-pull-request
• [main] 3 failures in test testDirectIOUsed (6.3% fail rate in 48 executions)
• [main] 2 failures in pipeline elasticsearch-pull-request (100.0% fail rate in 2 executions)

Build Scans:

• elasticsearch-periodic-platform-support #8568 / sles-15_platform-support-unix
• elasticsearch-pull-request #73622 / checkpart1_release-tests
• elasticsearch-pull-request #73574 / part-1-windows

[elasticsearchmachine]

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

[thecoop]

This is because we have turned off direct IO for now - #128784