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I’ve created an ElasticSearch cluster in Pulumi. What’s the right way to use the `endpoint` it outputs in the config files I generate for downstream resources? To get that value as a string, do I put the whole downstream resource inside the output’s `apply()`?

The typical approach is to do something like `prop: r.endpoint.apply(e =&gt; transform(e))`

That is, use `apply` to compute the value to pass as an input to some resource, instead of creating the resource itself within the `apply`. 

Ah, so I can use these transformed `Output`s in place of string parameters in my resources?

Yes - all inputs to resources are `Input&lt;T&gt;` which accepts a T or an Output&lt;T&gt;. 