elasticsearch7.x Indexing a grandchild document - elasticsearch

Question

Recently, I was studying the grandfather-grandchild documents in elasticsearch 7.x. I built an index myself and inserted data into it (see the code below), but I found that I can’t seem to find out the data.Did I do something wrong? thanks
mapping：
PUT /map
{
"mappings": {
"properties": {
"country": {
"properties": {
"id": {
"type": "integer"
},
"countryName": {
"type": "text"
}
}
},
"province": {
"properties": {
"id": {
"type": "integer"
},
"provinceName": {
"type": "text"
}
}
},
"city": {
"properties": {
"id": {
"type": "integer"
},
"cityName": {
"type": "text"
},
"attractions": {
"type": "text"
}
}
},
"my_join_field": {
"type": "join",
"relations": {
"country": "province",
"province": "city"
}
}
}
}
}
documents:
PUT map/_doc/1?refresh
{
"country.id": "1",
"country.countryName": "US",
"relationship": {
"name": "country"
}
}
PUT map/_doc/2?refresh
{
"country.id": "2",
"country.countryName": "CHINA",
"relationship": {
"name": "country"
}
}
PUT map/_doc/3?routing=1&refresh
{
"province.id": "3",
"province.provinceName": "losangeles",
"relationship": {
"name": "province",
"parent": "1"
}
}
PUT map/_doc/4?routing=1&refresh
{
"province.id": "4",
"province.provinceName": "chicago",
"relationship": {
"name": "province",
"parent": "1"
}
}
PUT map/_doc/5?routing=2&refresh
{
"province.id": "5",
"province.provinceName": "Anhui",
"relationship": {
"name": "province",
"parent": "2"
}
}
PUT map/_doc/6?routing=2&refresh
{
"province.id": "6",
"province.provinceName": "Shanghai",
"relationship": {
"name": "province",
"parent": "2"
}
}
PUT map/_doc/7?routing=2&refresh
{
"city.id": "7",
"city.cityName": "suzhou",
"city.attractions":"huangcangyu",
"relationship": {
"name": "city",
"parent": "5"
}
}
PUT map/_doc/8?routing=2&refresh
{
"city.id": "8",
"city.cityName": "maanshan",
"city.attractions":"caishiji",
"relationship": {
"name": "city",
"parent": "5"
}
}
query DSL：
GET /map/_search
{
"query": {
"has_child": {
"type": "province",
"query": {
"has_child": {
"type": "city",
"query": {
"match": {
"city.cityName": "maanshan"
}
}
}
}
}
}
}
There is no result from the query DSL above:
{
"took" : 0,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 0,
"relation" : "eq"
},
"max_score" : null,
"hits" : [ ]
}
}