I have a quick question :
There is a way at index time to add a field witch could represent something like an event_id ?
Something like this :
FORMAT = event_id::<any_random_value>
At this time I don't know how to generate a unique value to replace
No. If you're after getting unique id's for events, you could have a look at the _cd field which contains a bucket ID and an address within that bucket. A combination of index and _cd will be unique.
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