ECE to ELK migration

Hi I am new to elastic products. We have a requirement to migrate from ECE (Elastic Cloud Enterprise, paid version ) to ELK (Elasticsearch, Kibana, Log stash) Open source version. Is it possible to migrate with existing data.

Theoretically I can see possibilities:

  • configure ELK open source version on your premises as extension nodes of ECE and transfer data by excluding ECE nodes from holding data
  • create snapshot on ECE using external 3rd party storage , s3 compatible and restore it on new cluster
  • configure new ELK cluster as remote cluster for ECE and reindex data into new cluster

All above should be carefully verified, just giving some ideas.

Thank you. Is there any reference document to configure ELK open source version on premises as extension nodes of ECE?. please let me know.