I've migrated last week 500M documents (100GB) of data from mongodb to ES. It's quite simple and straightforward. Used the bulk API. Just make sure to have a good machine (16vCPU) and use parallelization and just wait. after 24hours, it just works.
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How do keep the ES index consistent with MongoDB?
That's only 200 bytes per document.
Can they be really considered 'documents' or are they actually database fields?
That's an average.