What algorithm is ElasticSearch create Document _Id based on?Could somebody answer me,plz

the _id is UUID?
If I want to specify my own ID, according to the formula(shard = hash(routing) % number_of_primary_shards), will it result in uneven sharding?
I'm confused about this. Can someone help me? plz, i'd really appreciate it .

The code that generates auto-generated IDs is below.

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Thank you , you are very kind....you're really help me a lot...:kissing_closed_eyes::kissing_closed_eyes::kissing_closed_eyes::kissing_closed_eyes::kissing_closed_eyes::kissing_closed_eyes::kissing_closed_eyes:

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