Query to a JSON file

I'm attempting to write ajax code in a PHP file that queries elasticsearch
server and returns a JSON document:

var load_data = function() {
$.ajax({ url: 'http://localhost:9200/inventory/_search?pretty=true'
, type: 'POST'
, data :

I'm not sure what I need to type before my query to return a JSON document.
Could someone lend a hand? :slight_smile:

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