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Elasticsearch evaluation disables IDF

I use ES to search a huge list of human names using fuzzy search methods.

TF is applicable for scoring, but in this case IDF is really not required for me. It really dilutes the bill. I still want TF and Field Norm applied to the score.

How to disable / disable IDF for my requests, but keep TF and Field Norm?

I came across Disable IDF Calculation , but that didn't help me. It seems that in this case, requesting a continuous evaluation would not help me.

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