Searches a string for an occurrence of a substring and returns the UTF-8 code point index of the first occurrence. If the substring is not found, returns -1
3.4
https://www.mongodb.com/docs/manual/reference/operator/aggregation/indexOfCP/#mongodb-expression-exp.-indexOfCP
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Searches a string for an occurrence of a substring and returns the UTF-8 code point index of the first occurrence. If the substring is not found, returns -1