Elasticsearch aggrestions not shown in response of ajax call - elasticsearch

Question

I have the following ajax call to get data from elasticsearch. My problem is that the response does not have the expected 'aggregations' field.
$.ajax({
url: 'http://elasticsearch.net:80/tenant/_search' ,
dataType: 'JSON',
type: 'GET',
data: {
"size": 0,
"aggs": {
"group_by_user_name": {
"terms": {
"field": "user_name"
}
}
}
},
success: function(response) {
console.log(response);
}
});
Object {took: 2, timed_out: false, _shards: Object, hits: Object}
_shards: Object
hits: Object
hits: Array[0]
length: 0
__proto__: Array[0]
max_score: 0
total: 3967
__proto__: Object
timed_out: false
took: 2
__proto__: Object
I've tried the request with curl and I see the 'aggregations' field. Any idea why I can't access this field in an ajax response?

Answer 1

See this stackoverflow post: Querying dynamic aggregation in elasticsearch with AJAX
Essentially, you need to use POST rather than GET.
What does your curl request look like?

Answer 2

You need to use POST instead of GET. When you are using GET , it disregards your body and provides the top hits alone.
Your CURL equal-ant of the query is as follows -
curl -XPOST http://elasticsearch.net:80/tenant/_search -d '{
"size": 0,
"aggs": {
"group_by_user_name": {
"terms": {
"field": "user_name"
}
}
}
}'

Answer 3

I tried POST earlier but I was getting a 400 error (Failed to derive xcontent from org.elasticsearch.common.bytes.ChannelBufferBytesReference). I played with it again and realized that what I was missing is converting the javascript object to JSON string:
$.ajax({
url: 'http://elasticsearch.net:80/tenant/_search' ,
dataType: 'JSON',
type: 'POST',
data: JSON.stringify({"size": 0,"aggs": {"group_by_user_name": {"terms": {"field": "user_name"}}}}),
success: function(response) {
console.log(response);
}
});
BTW, the curl request works with both GET and POST.
Thanks for your help!