Backing up an ephemeral Elasticsearch installation

I have an installation of Elasticsearch without persistence running and I need to back it up so we can move it to a persistent setup.

What are safe ways to do this and keep the data in the ES database?

It is running and I want to avoid shutting it down.

It is running in a container and I think the entrypoint starts the server. So stopping the cluster my stop my pod and get rid of all my data...

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