Exist any limitations on how a _id document field could be

Elastic Stack Elasticsearch
1

I always notice that the _id field of any index created is normaly a uuid, hash value or a simple numeric sucession depending of the use case.

My question is if there are any limitation in the form and aspect when choosing a custom _id beyond the be unique and avoid duplicates for a particular use case, for example related to throughput, or routing to shards.

2

_id field | Elasticsearch Guide [7.17] | Elastic goes into limitations on there, but it's really just;

_id is limited to 512 bytes in size and larger values will be rejected.

4

The content not matters in routing then?
As long as the id is unique the index will work correctly?

5

I dunno if they support all unicode, but otherwise, yes.

6

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