Dynamically Allocate Fields in the elasticsearch query

Elastic Stack Elasticsearch
1

I have a query

query:
{
query_string:
{
query: query,
fields: ["First_Name", "Last_Name"],
default_operator: "AND"
}
}

I am using AngularJS.
I want the value of the "fields:" to be provided at runtime ( through a
checkbox selection by the user from an html page)

How should I go about it ?

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