add heartbeat ds

[joeypoon]

Change Summary

adds heartbeat ds to be used for serverless metering / billing. endpoint PR: https://github.com/elastic/endpoint-dev/pull/13014.

Sample document:

{
    "@timestamp": "2023-07-18T20:40:09.279939Z",
    "agent": {
        "id": "aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"
    },
    "data_stream": {
        "dataset": "endpoint.heartbeat",
        "namespace": "default",
        "type": ".logs"
    },
    "message": "Endpoint heartbeat",
    "event": {
        "ingested": "2023-07-18T20:40:09.279939Z"
    }
}

Release Target

8.10

For mapping changes:

• I ran make after making the schema changes, and committed all changes

[elasticmachine]

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• Start Time: 2023-07-28T22:04:47.180+0000

• Duration: 7 min 24 sec

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[pzl]

not every day we add a new data stream! Looks good. Thanks for the sample_event for tests

[elasticmachine]

Package endpoint - 8.10.0 containing this change is available at https://epr.elastic.co/search?package=endpoint