[CI] UpgradeClusterClientYamlTestSuiteIT class failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #4489 / 8.1.3_bwc
• elasticsearch-periodic #4484 / 8.1.3_bwc

Reproduction Line:

./gradlew ":x-pack:qa:rolling-upgrade:v8.1.3#twoThirdsUpgradedTest" -Dtests.class="org.elasticsearch.upgrades.UpgradeClusterClientYamlTestSuiteIT" -Dtests.method="test {p0=mixed_cluster/140_user_profile/Test User Profile feature will work in a mixed cluster}" -Dtests.seed=96D417B98D4EE219 -Dtests.bwc=true -Dtests.locale=ga -Dtests.timezone=Asia/Qatar -Druntime.java=22

Applicable branches: 8.x

Reproduces locally?: N/A

Failure History: See dashboard

Failure Message:

java.lang.AssertionError: Failure in test setup: Failed to initialize at least 3 watcher nodes

Issue Reasons:

• [8.x] 2 failures in class org.elasticsearch.upgrades.UpgradeClusterClientYamlTestSuiteIT (0.2% fail rate in 1000 executions)
• [8.x] 2 failures in step 8.1.3_bwc (66.7% fail rate in 3 executions)
• [8.x] 2 failures in pipeline elasticsearch-periodic (50.0% fail rate in 4 executions)

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