What is the xpack.reporting.encryptionKey used for?

I am enabling reporting in Kibana, and in the configuration documentation there's a reference to a configuration named xpack.reporting.encryptionKey. From the documentation I understand what happens if I don't define it, but not what it is used for. Any idea of what this is used for?

Its used for encrypting data within Kibana which is definitely not clear in that documentation.

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