Is there a way with ElasticSearch to only show aggregations? - node.js

Question

I'm trying to retrieve some data from ElasticSearch.
So far everything is working perfectly and I can query data.
But whenever I try to count a field using aggregations, the aggregation field is not in the result at the end.
So far what I've tried this as my query/function :
var client = new elasticsearch.Client({
host: 'xxxxxxxxxxxxxxxxxxxxxxx',
log:"trace"
});
client.ping({
requestTimeout: 30000,
}, function (error) {
if (error) {
console.error('elasticsearch cluster is down!');
} else {
console.log('All is well');
}
});
client.search({
"index":"worklight__appsession__1485302400000",
"type":"AppSession",
"body":{
"query": {
"filtered": {
"query": {
"query_string": {
"analyze_wildcard": true,
"query": "*"
}
},
"filter": {
"bool": {
"must": [
{
"range": {
"timestamp": {
"gte": 1553507131976,
"lte": 1553593531976
}
}
}
],
"must_not": []
}
}
}
},
"aggs": {
"1": {
"cardinality": {
"field": "deviceID"
}
}
}
}
}).then(function (resp) {
var hits = resp.hits.hits;
console.log(hits)
}, function (err) {
console.trace(err.message);
});
and the result is :
Elasticsearch DEBUG: 2019-03-26T09:46:21Z
starting request {
"method": "HEAD",
"requestTimeout": 30000,
"castExists": true,
"path": "/",
"query": {}
}
Elasticsearch DEBUG: 2019-03-26T09:46:21Z
starting request {
"method": "POST",
"path": "/worklight__appsession__1485302400000/AppSession/_search",
"body": {
"query": {
"filtered": {
"query": {
"query_string": {
"analyze_wildcard": true,
"query": "*"
}
},
"filter": {
"bool": {
"must": [
{
"range": {
"timestamp": {
"gte": 1553507131976,
"lte": 1553593531976
}
}
}
],
"must_not": []
}
}
}
},
"aggs": {
"1": {
"cardinality": {
"field": "deviceID"
}
}
}
},
"query": {}
}
Elasticsearch TRACE: 2019-03-26T09:46:22Z
-> HEAD http://xx/
<- 200
Elasticsearch DEBUG: 2019-03-26T09:46:22Z
Request complete
All is well
Elasticsearch TRACE: 2019-03-26T09:46:22Z
-> POST http://xx/worklight__appsession__1485302400000/AppSession/_search
{
"query": {
"filtered": {
"query": {
"query_string": {
"analyze_wildcard": true,
"query": "*"
}
},
"filter": {
"bool": {
"must": [
{
"range": {
"timestamp": {
"gte": 1553507131976,
"lte": 1553593531976
}
}
}
],
"must_not": []
}
}
}
},
"aggs": {
"1": {
"cardinality": {
"field": "deviceID"
}
}
}
}
<- 200
{
"took": 4,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
},
"hits": {
"total": 325,
"max_score": 1,
"hits": [
...
confidential data here, not relevant to the topic.
...
}
]
},
"aggregations": {
"1": {
"value": 133
}
}
}
But if erase the log trace option, aggregations don't show up in the result :
[ { _index: 'worklight__appsession__1485302400000',
_type: 'AppSession',
... Some Data,
{ _index: 'worklight__appsession__1485302400000',
_type: 'AppSession',
... Some Data,
{ _index: 'worklight__appsession__1485302400000',
_type: 'AppSession',
... Some Data,
]
Am I doing something wrong, or do I just lack knowledge ?
Thanks for your time.

Answer 1

You are doing console.log(resp.hits.hits). Try this instead:
console.log(resp.aggregations)