This functionality is in beta and is subject to change. The design and code is considered to be less mature than official GA features. Elastic will take a best effort approach to fix any issues, but beta features are not subject to the support SLA of official GA features.
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Elastic Docs ›Heartbeat Reference [6.3]

Securing Heartbeat

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IMPORTANT: This documentation is no longer updated. Refer to Elastic's version policy and the latest documentation.

Securing Heartbeat

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The following topics describe how to secure communication between Heartbeat and other products in the Elastic stack:

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