Enforce no match if term in search is duplicated

I noticed that if I replicate a term in the search expression, the relevance of documents containing it only once will increase. Though my expected behavior is to omit them from the results.

doc 1 :Fred Fredrickson
doc2: Fred Waters

search term: fred fred
I want doc1 but not doc2.

How to achieve this? My index is standard+ngrams and I use AND operatior for ngrams macthing and bool+must for full word matching

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