Case insensitive term query (case_insensitive) performance penalty?


Is there any significant performance penalty for using case_insensitive: true in term queries?

If I use keyword mapping with lowercase normalizer, highlighter would emit lowercased results which I would like to avoid. I can index it as text with keyword tokenizer and lowercase filter but the nature of the field is keyword and I would like to keep it as such while being able to match case insensitive preserve case in highlighter.
case_insensitive: true would take care of all this but I could not find any info on how it is implemented and if it has any considerable performance penalty

Thank you,

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