CCSDuelIT test testTermsAggs failing

[smalyshev]

CCSDuelIT testTermsAggs failing

Build Scans:

• Failed CI Run

Reproduction Line:

./gradlew ":qa:multi-cluster-search:v9.2.0#multi-cluster" -Dtests.class="org.elasticsearch.search.CCSDuelIT" -Dtests.method="testTermsAggs" -Dtests.seed=715C663B6AD605D8 -Dtests.bwc=true -Dtests.locale=gd-Latn-GB -Dtests.timezone=Canada/Saskatchewan -Druntime.java=24 

Failure Message:

java.lang.AssertionError: Comparing sync_search minimizeRoundTrip vs. fanOut. Didn't match expected value. /aggregations/filter#answers/sterms#answer_per_question/doc_count_error_upper_bound: the elements don't match: [2] != [5]. 

Note:
This issue was created from stale AwaitsFix test. See #132306 for more details.

[elasticsearchmachine]

Pinging @elastic/es-analytical-engine (Team:Analytics)

[astefan]

@nik9000 @not-napoleon this is in the same line as #132880. Meaning, an old issue from 2019 that was supposed to be reopened in 2022: #40005

[astefan]

Flagging it as low-risk since the original issue is very old and there were no other mentions since 2022.