[CI] SystemIndicesUpgradeIT class failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #7228 / 8.0.1_bwc
• elasticsearch-periodic #7221 / 8.0.1_bwc

Reproduction Line:

undefined

Applicable branches:
8.x

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

undefined

Issue Reasons:

• [8.x] 2 failures in class org.elasticsearch.upgrades.SystemIndicesUpgradeIT (0.2% fail rate in 1000 executions)
• [8.x] 2 failures in step 8.0.1_bwc (100.0% fail rate in 2 executions)
• [8.x] 2 failures in pipeline elasticsearch-periodic (66.7% fail rate in 3 executions)

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

[elasticsearchmachine]

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

[ldematte]

@alexey-ivanov-es do you thing this is solved by your latest changes?
It seems to be failing across multiple backward compatbility and upgrade tests.
Looking at the logs, I see

java.lang.AssertionError: expected empty context but was {X-elastic-product-origin=fleet}

[ldematte]

It only happens with 8.0.1, but with 8.0.1 bwc it seems to be happening quite consistently (see also #125168)
Ah, it's a but on 8.0.1, we should probably just exclude this test too -- see #125167.

Since it's a test issue, I'll put low-risk, but probably we should fix it quick before it gets muted.

[JVerwolf]

Fixed by #127730