Keyword Insensitive Match

any way to make a keyword type case insensitive ? an example would be me using match query and the input would be "input" and the output "InPuT"

You can use a lowercase normalizer.

the problem i have now is that the normalizer applys for all my fields? i want my username field to be case insensitive but my email field to not have anything


this method seems to work but im not sure its the right way

"settings": {
    "analysis": {
        "normalizer": {
            "lowercase": {
                "type": "custom",
                "filter": "lowercase"
    "number_of_replicas": 0,
    "auto_expand_replicas": false
"mappings": {
    "properties": {
        "username": {
            "type": "keyword",
            "normalizer": "lowercase"
        "email": {
            "type": "keyword"

It is.

does this normalizer have any limitations ? like certain characters that arent allowed?

I don't think so.

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