Create a document id using more than 2 fields

How can one create a document id using multiple fields, more than just two? I'm trying to use more than 3 fields but it doesn't seem to accept it unless there is another way to do it.
Right now i'm using this format:
document_id => "%{field1}%{field2}%{field3}%{field4}%{field5}%{field6}"

I would expect that to work. What makes you think it is not working?

Because the id being returned is for example

However, I'm messing around with it and the issue maybe cause the fields given were in uppercase and it seems like it always needs to be lowercase but still testing this.

Ok yeah that worked. All fields must be lowercase and not uppercase at all. Thank you @Badger

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