[CI] TransportClusterStateActionTests testGetClusterStateWithDefaultProjectOnly failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #10541 / amazonlinux-2023_platform-support-aws
• elasticsearch-periodic-platform-support #10541 / oraclelinux-8_platform-support-unix
• elasticsearch-periodic-platform-support #10541 / rocky-9_platform-support-unix
• elasticsearch-periodic #10551 / openjdk21_checkpart1_java-matrix
• elasticsearch-pull-request #91064 / part-1-fips
• elasticsearch-intake #28221 / part1
• elasticsearch-intake #28220 / part1

Reproduction Line:

./gradlew ":server:test" --tests "org.elasticsearch.action.admin.cluster.state.TransportClusterStateActionTests.testGetClusterStateWithDefaultProjectOnly" -Dtests.seed=7C98BA2664E66BE8 -Dtests.locale=it-VA -Dtests.timezone=Europe/Samara -Druntime.java=24

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: 
Expected: a map with size <2>
     but: map size was <1>

Issue Reasons:

• [main] 7 failures in test testGetClusterStateWithDefaultProjectOnly (2.5% fail rate in 282 executions)
• [main] 2 failures in step part1 (5.3% fail rate in 38 executions)
• [main] 2 failures in pipeline elasticsearch-intake (5.3% fail rate in 38 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 testGetClusterStateWithDefaultProjectOnly (0.7% fail rate in 280 executions)
• [main] 2 failures in step part1 (5.1% fail rate in 39 executions)
• [main] 2 failures in pipeline elasticsearch-intake (5.1% fail rate in 39 executions)

Build Scans:

• elasticsearch-intake #28221 / part1
• elasticsearch-intake #28220 / part1

[elasticsearchmachine]

Pinging @elastic/es-core-infra (Team:Core/Infra)

[mosche]

@alexey-ivanov-es ping, looks related to your changes