Difference between _version and [_seq_no, _primary_term]

It seems to me that both versioning (_version; See here) and [_seq_no, _primary_term] (See here) are used for optimistic concurrency control (e.g., to determine the version of a document we want to update). What's the difference between them and when should we use each?

You should use _seq_no and _primary_term.


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