Am afraid , code is always the best docs, second best is the PR at the moment: I could find this one :
This PR creates an import / export API for dashboards. The current implementation under Mangement > Saved Objects allows you to only export everything or individual dashboards (with out the support...
If you only want dashboards, this api will export all of a dashboards dependencies. The saved object api is your best bet for granular requests, index patterns and so on.
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