[Website]: Document / check what happens when not providing es_datastream_name

[lucabelluccini]

Type of issue

None

What documentation page is affected

https://www.elastic.co/docs/reference/integrations/awsfirehose

What happened?

We should clarify what happens if someone doesn't define es_datastream_name.

From the docs, it looks like it should go to logs-awsfirehose-default data stream, but from a recent test it seems it doesn't and requests are rejected with a 400 error.

Still, it's unclear what data stream will be used when shipping logs or metrics not supported by the integration.

• Or we're not honoring the default logs-awsfirehose-default data stream
• Or the setting es_datastream_name is mandatory when shipping logs or metrics not supported by AWS Firehose integration.

Additional info

This requires engineering check prior to be documented.