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.

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