Update Existing Mapping

How to update Existing mapping in Index?

"firstName" : {
"type" : "multi_field",
"fields" : {
"firstName" : {
"type" : "string"
}
"index_options" : "docs",
"include_in_all" : false
}
}

Here i want update *"index_options" : "docs" *to "index_options" :
"positions",

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Unfortunately you can't "update" the index_options after it's in already.
You'll need to delete your index and redefine the mapping.

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