elasticsearch why facet is so slow? - elasticsearch

Question

For below query without facet. it tooks 18 milli seconds.
But after adding facet it tooks 7408 milli seconds.
I am having 183M records.
Facets provide aggregated data based on a search query. right???
Then why facet is taking so much time for doing aggregation on 40 records?
Query Without facet: Tooks 18 Milli Seconds
{
"query": {
"filtered": {
"filter": {
"bool": {
"must": [
{
"term": {
"country_raw": "united states"
}
},
{
"term": {
"title_raw": "manager"
}
}
]
}
}
}
}
}
Response for without facet query:
{
"took": 18,
"timed_out": false,
"_shards": {
"total": 6,
"successful": 6,
"failed": 0
},
"hits": {
"total": 40,
"max_score": 1,
"hits": [
....
]
}
}
Query With facet: : Tooks 7845 Milli Seconds
{
"size": 0
"facets": {
"title_facet": {
"terms": {
"field": "title_raw",
"size": 5
}
}
},
"query": {
"filtered": {
"filter": {
"bool": {
"must": [
{
"term": {
"country_raw": "united states"
}
},
{
"term": {
"title_raw": "manager"
}
}
]
}
}
}
}
}
Facet Query Response
{
"took": 7408,
"timed_out": false,
"_shards": {
"total": 6,
"successful": 6,
"failed": 0
},
"hits": {
"total": 40,
"max_score": 0,
"hits": [ ]
},
"facets": {
"title_facet": {
"_type": "terms",
"missing": 0,
"total": 40,
"other": 0,
"terms": [
{
"term": "manager",
"count": 40
}
]
}
}
}

Answer 1

did you try with "aggs" instead of "facet" ( i remember that facet are depreceated )
https://www.elastic.co/guide/en/elasticsearch/reference/1.4/search-aggregations-bucket-terms-aggregation.html
{
"query" : {
"filtered" : {
"filter" : {
"bool" : {
"must" : [{
"term" : {
"country_raw" : "united states"
}
}, {
"term" : {
"title_raw" : "manager"
}
}
]
}
}
}
},
"aggs" : {
"title_facet" : {
"terms" : {
"field" : "title_raw",
"size" : 5
}
}
},
"sort" : {
"_score" : "desc"
}
}