Analyze results with aggregations
[https://www.elastic.co/guide/en/elasticsearch/reference/current/getting-started-aggregations.html:embed:cite]
キーワードで集計
curl -XGET 'localhost:9200/bank/_search?pretty' -H 'Content-Type: application/json' -d '{
"size": 0,
"aggs": {
"group_by_state": {
"terms": {
"field": "state.keyword"
}
}
}
}'{
"took" : 49,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 1000,
"relation" : "eq"
},
"max_score" : null,
"hits" : [ ]
},
"aggregations" : {
"group_by_state" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 743,
"buckets" : [
{
"key" : "TX",
"doc_count" : 30
},
{
"key" : "MD",
"doc_count" : 28
},
{
"key" : "ID",
"doc_count" : 27
},
{
"key" : "AL",
"doc_count" : 25
},
{
"key" : "ME",
"doc_count" : 25
},
{
"key" : "TN",
"doc_count" : 25
},
{
"key" : "WY",
"doc_count" : 25
},
{
"key" : "DC",
"doc_count" : 24
},
{
"key" : "MA",
"doc_count" : 24
},
{
"key" : "ND",
"doc_count" : 24
}
]
}
}
}"size": 0指定につき、hits.hitsは0件- 代わりに
"aggregations"がある
...
"aggs": {
"group_by_state": {
"terms": {
"field": "state.keyword"
}
}
...group_by_stateという名前で集計- 集計条件は、
state(州)のキーワードの一致
{
...
"aggregations" : {
"group_by_state" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 743,
"buckets" : [
{
"key" : "TX",
"doc_count" : 30
},
{
"key" : "MD",
"doc_count" : 28
},
{
"key" : "ID",
"doc_count" : 27
},
{
"key" : "AL",
"doc_count" : 25
},
{
"key" : "ME",
"doc_count" : 25
},
{
"key" : "TN",
"doc_count" : 25
},
{
"key" : "WY",
"doc_count" : 25
},
{
"key" : "DC",
"doc_count" : 24
},
{
"key" : "MA",
"doc_count" : 24
},
{
"key" : "ND",
"doc_count" : 24
}
]
}
}
}- 州ごとのドキュメント数が集計される
- デフォルト降順の10件
- 一番多い
TX(テキサス)でキーワード一致検索してみる
curl -XGET 'localhost:9200/bank/_search?pretty' -H 'Content-Type: application/json' -d '{
"size": 0,
"query": {
"match": {
"state": "TX"
}
}
}'{
"took" : 2,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 30,
"relation" : "eq"
},
"max_score" : null,
"hits" : [ ]
}
}- 確かに30件
...
"total" : {
"value" : 30,
"relation" : "eq"
},
...集計組み合わせ
- 州ごとにドキュメントを集計 (外側のaggs)
- 各州の最低・平均・最高残高を集計 (内側のaggs)
- 平均残高上位3州を表示 (表示するのが州なので外側のaggs)
curl -XGET 'localhost:9200/bank/_search?pretty' -H 'Content-Type: application/json' -d '{
"size": 0,
"aggs": {
"group_by_state": {
"terms": {
"field": "state.keyword",
"size": 3,
"order": {
"average_balance": "desc"
}
},
"aggs": {
"min_balance": {
"min": {
"field": "balance"
}
},
"average_balance": {
"avg": {
"field": "balance"
}
},
"max_balance": {
"max": {
"field": "balance"
}
}
}
}
}
}'{
"took" : 5,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 1000,
"relation" : "eq"
},
"max_score" : null,
"hits" : [ ]
},
"aggregations" : {
"group_by_state" : {
"doc_count_error_upper_bound" : -1,
"sum_other_doc_count" : 956,
"buckets" : [
{
"key" : "CO",
"doc_count" : 14,
"min_balance" : {
"value" : 8840.0
},
"max_balance" : {
"value" : 49119.0
},
"average_balance" : {
"value" : 32460.35714285714
}
},
{
"key" : "NE",
"doc_count" : 16,
"min_balance" : {
"value" : 17128.0
},
"max_balance" : {
"value" : 47091.0
},
"average_balance" : {
"value" : 32041.5625
}
},
{
"key" : "AZ",
"doc_count" : 14,
"min_balance" : {
"value" : 6176.0
},
"max_balance" : {
"value" : 49205.0
},
"average_balance" : {
"value" : 31634.785714285714
}
}
]
}
}
}