Returns the substring of a string. Starts with the character at the specified UTF-8 code point (CP) index (zero-based) in the string and continues for the number of code points specified.
3.4
https://docs.mongodb.com/manual/reference/operator/aggregation/substrCP/#mongodb-expression-exp.-substrCP
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Returns the substring of a string. Starts with the character at the specified UTF-8 code point (CP) index (zero-based) in the string and continues for the number of code points specified.
3.4
https://docs.mongodb.com/manual/reference/operator/aggregation/substrCP/#mongodb-expression-exp.-substrCP