[CI] Ec2DiscoveryTests testPublicIp failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #4293 / openjdk23_java-matrix
• elasticsearch-periodic #4253 / openjdk23_java-matrix

Reproduction Line:

./gradlew ':plugins:discovery-ec2:test' --tests "org.elasticsearch.discovery.ec2.Ec2DiscoveryTests.testPublicIp" -Dtests.seed=67E5E30A1DC80CD3 -Dtests.locale=ne -Dtests.timezone=America/Virgin -Druntime.java=23

Applicable branches:
7.17

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: 
Expected: a collection with size <5>
     but: collection size was <0>

Issue Reasons:

• [7.17] 2 consecutive failures in step openjdk23_java-matrix
• [7.17] 2 failures in test testPublicIp (0.5% fail rate in 414 executions)
• [7.17] 2 failures in step openjdk23_java-matrix (100.0% fail rate in 2 executions)
• [7.17] 2 failures in pipeline elasticsearch-periodic (18.2% fail rate in 11 executions)

Note:
This issue was created using new test triage automation. Please report issues or feedback to es-delivery.

[elasticsearchmachine]

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