[CI] CoreFullClusterRestartIT testSearch {cluster=OLD} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #11071 / 7.4.2_bwc
• elasticsearch-periodic #11071 / 7.5.2_bwc
• elasticsearch-periodic #11064 / 7.4.2_bwc
• elasticsearch-periodic #11064 / 7.5.2_bwc
• elasticsearch-periodic #11057 / 7.4.2_bwc
• elasticsearch-periodic #11057 / 7.5.2_bwc
• elasticsearch-periodic #11050 / 7.4.2_bwc
• elasticsearch-periodic #11050 / 7.5.2_bwc
• elasticsearch-periodic #11043 / 7.5.2_bwc
• elasticsearch-periodic #11043 / 7.4.2_bwc

Reproduction Line:

./gradlew ":x-pack:qa:full-cluster-restart:v7.4.2#bwcTest" -Dtests.class="org.elasticsearch.xpack.restart.CoreFullClusterRestartIT" -Dtests.method="testSearch {cluster=OLD}" -Dtests.seed=6C9780494DC23486 -Dtests.bwc=true -Dtests.locale=dje-NE -Dtests.timezone=America/Pangnirtung -Druntime.java=25

Applicable branches:
8.19

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

org.elasticsearch.client.WarningFailureException: method [PUT], host [http://[::1]:35421], URI [/testsearch/_settings], status line [HTTP/1.1 200 OK]
Warnings: [[processors] setting was deprecated in Elasticsearch and will be removed in a future release! See the breaking changes documentation for the next major version.]
{"acknowledged":true}

Issue Reasons:

• [8.19] 15 consecutive failures in step 7.4.2_bwc
• [8.19] 15 consecutive failures in step 7.5.2_bwc
• [8.19] 30 failures in test testSearch {cluster=OLD} (3.5% fail rate in 866 executions)
• [8.19] 15 failures in step 7.4.2_bwc (100.0% fail rate in 15 executions)
• [8.19] 15 failures in step 7.5.2_bwc (100.0% fail rate in 15 executions)
• [8.19] 15 failures in pipeline elasticsearch-periodic (100.0% fail rate in 15 executions)

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

[elasticsearchmachine]

Pinging @elastic/es-delivery (Team:Delivery)

[jozala]

Same as #135969

[jozala]

Fixed in #136181 by using newer node.processors setting since 7.4.
No longer failing in periodic builds BwC 7.4 and 7.5.