[英]Elasticsearch: Filter array elements in nested documents
目前我正在嘗試了解 Elasticsearch 文檔的結構和這些響應。 我創建了一些索引並添加了一些文檔來學習基礎知識。 現在我正在為嵌套字典的響應而苦苦掙扎。
最近我在現有索引中添加了 2 個文檔:
{
{"id": 1,
"vehicle": "car",
"equipment": [
{"v_id": 24, "gps": true,"color": "black"}
{"v_id": 11, "gps": false, "color": "yellow"}
]
},
{"id": 2,
"vehicle": "bus",
"equipment": [
{"v_id": 34, "gps": false,"color": "red"}
{"v_id": 99, "gps": false,"color": "yellow"}
{"v_id": 10, "gps": true,"color": "red"}
]
}
}
現在我想使用查詢檢索所有黃色車輛:
{
"query": {
"match": {
"equipment.color": "yellow“
}
}
}
我會得到如下回復:
{
{"id": 1,
"vehicle": "car",
"equipment": [
{"v_id": 24, "gps": true,"color": "black"}
{"v_id": 11, "gps": false, "color": "yellow"}
]
},
{"id": 2,
"vehicle": "bus",
"equipment": [
{"v_id": 34, "gps": false,"color": "red"}
{"v_id": 99, "gps": false,"color": "yellow"}
{"v_id": 10, "gps": true,"color": "red"}
]
}
}
因為這兩個文檔都包含一個顏色值為“黃色”的車輛。 實際上,我嘗試從響應中過濾出一些數組元素,並希望響應看起來像這樣:
{
{"id": 1,
"vehicle": "car",
"equipment": [
{"v_id": 11, "gps": false, "color": "yellow"}
]
},
{"id": 2,
"vehicle": "bus",
"equipment": [
{"v_id": 99, "gps": false,"color": "yellow"}
]
}
}
Elasticsearch 或一般字典可以做到這一點嗎? 如果答案是肯定的,那么查詢主體應該是什么樣子?
非常感謝,西科
您需要將嵌套查詢與inner_hits一起使用
添加具有索引映射、搜索查詢和搜索結果的工作示例
索引映射:
PUT myidx
{
"mappings": {
"properties": {
"equipment":{
"type":"nested"
}
}
}
}
搜索查詢:
POST myidx/_search
{
"query": {
"nested": {
"path": "equipment",
"query": {
"match": {
"equipment.color": "yellow"
}
},
"inner_hits": {}
}
}
}
搜索結果:
{
"took" : 432,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 2,
"relation" : "eq"
},
"max_score" : 0.87546873,
"hits" : [
{
"_index" : "myidx",
"_type" : "_doc",
"_id" : "1",
"_score" : 0.87546873,
"_source" : {
"id" : 1,
"vehicle" : "car",
"equipment" : [
{
"v_id" : 24,
"gps" : true,
"color" : "black"
},
{
"v_id" : 11,
"gps" : false,
"color" : "yellow"
}
]
},
"inner_hits" : {
"equipment" : {
"hits" : {
"total" : {
"value" : 1,
"relation" : "eq"
},
"max_score" : 0.87546873,
"hits" : [
{
"_index" : "myidx",
"_type" : "_doc",
"_id" : "1",
"_nested" : {
"field" : "equipment",
"offset" : 1
},
"_score" : 0.87546873,
"_source" : {
"v_id" : 11,
"color" : "yellow",
"gps" : false // note this
}
}
]
}
}
}
},
{
"_index" : "myidx",
"_type" : "_doc",
"_id" : "2",
"_score" : 0.87546873,
"_source" : {
"id" : 2,
"vehicle" : "bus",
"equipment" : [
{
"v_id" : 34,
"gps" : false,
"color" : "red"
},
{
"v_id" : 99,
"gps" : false,
"color" : "yellow"
},
{
"v_id" : 10,
"gps" : true,
"color" : "red"
}
]
},
"inner_hits" : {
"equipment" : {
"hits" : {
"total" : {
"value" : 1,
"relation" : "eq"
},
"max_score" : 0.87546873,
"hits" : [
{
"_index" : "myidx",
"_type" : "_doc",
"_id" : "2",
"_nested" : {
"field" : "equipment",
"offset" : 1
},
"_score" : 0.87546873,
"_source" : {
"v_id" : 99,
"color" : "yellow", // note this
"gps" : false
}
}
]
}
}
}
}
]
}
}
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