[9.1] (backport #11254) Use unique index for TestOtelLogsIngestion

[mergify]

What does this PR do?

Use unique index for TestOtelLogsIngestion

Why is it important?

TestOtelLogsIngestion was flaky and could cause other tests to become flaky due to mapping conflicts, using a unique index fixes the problem.

Checklist

• I have read and understood the pull request guidelines of this project.
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in ./changelog/fragments using the changelog tool
• I have added an integration test or an E2E test

## Disruptive User Impact

How to test this PR locally

Start a Elastic Stack and export the following env vars:

ELASTICSEARCH_HOST
ELASTICSEARCH_USERNAME
ELASTICSEARCH_PASSWORD
KIBANA_HOST
KIBANA_USERNAME
KIBANA_PASSWORD

Package and run the tests:

# Package Elastic Agent, adjust according to your OS
DEV=true SNAPSHOT=true EXTERNAL=true PACKAGES="tar.gz" PLATFORMS=linux/amd64 mage -v package

# Run the tests, adjust according to your OS
DEV=true SNAPSHOT=true EXTERNAL=true PACKAGES="tar.gz" PLATFORMS=linux/amd64 AGENT_VERSION="9.3.0-SNAPSHOT" mage -v integration:local TestOtelLogsIngestion

Related issues

• Closes [Flaky Test]: TestOtelLogsIngestion – Expected 10000 logs, got &{0} #7222

Questions to ask yourself

• How are we going to support this in production?
• How are we going to measure its adoption?
• How are we going to debug this?
• What are the metrics I should take care of?
• ...

---

This is an automatic backport of pull request #11254 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 85241ff has failed:

On branch mergify/bp/9.1/pr-11254
Your branch is up to date with 'origin/9.1'.

You are currently cherry-picking commit 85241ff32.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .gitignore
	modified:   testing/integration/ess/otel_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   magefile.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[elasticmachine]

Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

[belimawr]

Auto-merge enabled

[elasticmachine]

💔 Build Failed

• Buildkite Build
• Commit: 17a1020

Failed CI Steps

• Unit tests - Windows 10
• Unit tests - Windows 10
• Win2022:non-sudo:default
• Win2022:non-sudo:default
• Win2025:non-sudo:default
• Win2025:non-sudo:default
• x86_64:non-sudo: default
• x86_64:non-sudo: default
• x86_64:non-sudo: default - platform-ingest-elastic-agent-debian-11-1764775167
• x86_64:non-sudo: default - platform-ingest-elastic-agent-debian-11-1764775167
• x86_64:non-sudo: default - platform-ingest-elastic-agent-debian-13-1764775167
• x86_64:non-sudo: default - platform-ingest-elastic-agent-debian-13-1764775167

History

• 💔 Build #31399 failed 4c5f052
• 💔 Build #31015 failed 887224a
• 💔 Build #31010 failed 1b5faee

cc @belimawr