Deploying ElasticSearch with native scripts

Hi all,
We want to deploy elasticsearch server for our application. The major problem is that we have native scripts being used in elasticsearch. The scripts produce calculated fields, which are used both in filtering and sorting. We tried using bonsai but there multi-tenant cluster doesn't expose a way for users to upload native scripts and the single-tenant server is way too pricey for just demo's.

Any suggestions or any other elasticsearch cloud hosting services that would allow us to upload native scripts.

UPDATE: Shelly cloud also doesn't support native scripts in elasticsearch.