[Discuss] Support for bulk upload API

As you may know, the `shared-ux` team is working on sample data re-architecture, and we'd like to leverage EPR for that. (Previous discussion [here](https://github.com/elastic/package-spec/issues/346)). Right now, sample data is a (gzipped) json [file](https://github.com/elastic/kibana/blob/main/src/plugins/home/server/services/sample_data/data_sets/flights/flights.json.gz) with Elasticsearch documents that are then bulk-uploaded to ES when a user requests an install.
If we were to add a new integration that would contain this sample data, what is the best way to make the bulk upload work?

cc @joshdover