Start-with phrase search in document _id. Case-sensitivity problem

I want to search a phrase in document _id.
I added configuration to mapping template: "_id" : { "index":
"not_analyzed" }. It works just fine, the problem occurs when _id contains
lowercase and uppercase letters. For example for _id "BigMonkey" it
searches phrase by "*onkey" but can't find it by "*Monkey". How this can be
fixed?

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