Setting unique _id

Elastic Stack Elasticsearch
1

Hi, in my application I have to prevent the insertion of duplicates, so what I did until now is to set as _id a digest of my message.
But I realized that two documents in different index can have same _id.

My index pattern:
logstash-YYYY.DD.MM

So if the same message arrives in two different days I will have two log entries with the same _id.

Is there a way to have a unique index per pattern or the only solution is to have just one index?

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