Does anyone know if the doc _id field has to follow a standard or pattern?

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We have a system that uses the path of the URL as doc ID. Everything ran ok until this week when we received a couple of bad requests and transportation errors coming from URLs like this one ../../../example or .. We use the python client and the get function to search the doc by ID, those petitions translated to kibana would be something like this
GET example-index/_doc/../../../example or GET example-index/_doc/.

Thanks in advance for any information or clarification that you could give me.

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Hello,

What is the issue you had? It is not clear, it is also not clear how you create your _id as you didn't share any example.

If I'm not wrong the only limitation for the _id field is regarding the size, it needs to be smaller than 512 bytes as described in the documentation.

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