[filestream] add warning about only ingesting files >= 1024 bytes

[belimawr]

Proposed commit message

This commit adds a message at the beginning of the Custom Logs (Filestream) integration warning that only files >= 1024 bytes in size will be ingested and pointing to the documentation to change this behaviour.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• ~~I have verified that any added dashboard complies with Kibana's Dashboard good practices ~~

## Author's Checklist

How to test this PR locally

Build the package
Deploy the package
Look at the documentation

## Related issues

Screenshots

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)

[mauri870]

@belimawr Do you mind also fixing the formatting for bold text while at it? For bold to work there should be no spaces after or before **.

For example today it looks like this in multiple places:

I was about to open a separate PR but it seems simple enough that you can fix it here.

[belimawr]

Thanks for spotting that @mauri870! They're fixed now.

[belimawr]

I've enabled auto-merge

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: f1a22c4

History

• 💚 Build #27127 succeeded 90ed44f
• 💚 Build #27125 succeeded 9894ee9

cc @belimawr

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[elastic-vault-github-plugin-prod]

Package filestream - 1.1.4 containing this change is available at https://epr.elastic.co/package/filestream/1.1.4/