Elasticsearch版本 版本：6.2.2
我正在尝试搜索两个都有嵌套对象的索引。为了简单起见，我将使用这个例子。在查询中我使用“inner_hits”属性。
PUT /sales
{
"mappings": {
"_doc" : {
"properties" : {
"tags" : { "type" : "keyword" },
"comments" : {
"type" : "nested",
"properties" : {
"username" : { "type" : "keyword" },
"comment" : { "type" : "text" }
}
}
}
}
}
}
PUT /sales/_doc/1?refresh
{
"tags": ["car", "auto"],
"comments": [
{"username": "baddriver007", "comment": "This car could have better brakes"},
{"username": "dr_who", "comment": "Where's the autopilot? Can't find it"},
{"username": "ilovemotorbikes", "comment": "This car has two extra wheels"}
]
}
PUT /markets
{
"mappings": {
"_doc" : {
"properties" : {
"name" : { "type" : "keyword" },
"products" : {
"type" : "nested",
"properties" : {
"name" : { "type" : "keyword" },
"sku" : { "type" : "text" }
}
}
}
}
}
}
POST /sales,markets/_search
{
"query": {
"bool": {
"should": [
{
"bool": {
"should": [
{
"nested": {
"path": "comments",
"inner_hits": {
},
"ignore_unmapped": true,
"query": {
"match_all": {}
}
}
}]
}
},
{
"bool": {
"should": [
{
"nested": {
"path": "products",
"inner_hits": {
},
"ignore_unmapped": true,
"query": {
"match_all": {}
}
}
}
]
}
}
]
}
}
}
所以这个查询会出错
{
"error": {
"root_cause": [
{
"type": "illegal_state_exception",
"reason": "[match_all] no mapping found for type [comments]"
},
{
"type": "illegal_state_exception",
"reason": "[match_all] no mapping found for type [products]"
}
],
"type": "search_phase_execution_exception",
"reason": "all shards failed",
"phase": "query",
"grouped": true,
"failed_shards": [
{
"shard": 0,
"index": "markets",
"node": "-22psoQNRLa8_Y9GeHBXaw",
"reason": {
"type": "illegal_state_exception",
"reason": "[match_all] no mapping found for type [comments]"
}
},
{
"shard": 0,
"index": "sales",
"node": "-22psoQNRLa8_Y9GeHBXaw",
"reason": {
"type": "illegal_state_exception",
"reason": "[match_all] no mapping found for type [products]"
}
}
]
},
"status": 500
}
但是当我在每个“inner_hits”中添加“ignore_unmapped”：true时：{“ignore_unmapped”：true}一切正常。这在NEST .net库中没有实现。
在“inner_hits”中使用“ignore_unmapped”是否正确，因为我在文档中没有找到这个“inner_hits”属性？ 在NEST还有其他解决方案可以做到这一点。
更新：
我尝试使用运算符重载查询，我得到了
Func<SearchDescriptor<object>, ISearchRequest> search = s => s.Type<object>()
.Index(Indices.Index("sales", "markets"))
.AllTypes()
.Explain(false)
.Query(q => (q
.Nested(n => n
.IgnoreUnmapped(true)
.Path(Infer.Field<SaleDocument>(f => f.Comments))
.InnerHits(ih => ih
.Size(1)
)
.Query(q1 => q1
.MatchAll()
)
) && +q.Terms(t => t
.Field("_index")
.Terms(new[] { "sales" })
)
) || (q
.Nested(n => n
.IgnoreUnmapped(true)
.Path(Infer.Field<MarketDocument>(f => f.Products))
.InnerHits(ih => ih
.Size(1)
)
.Query(q1 => q1
.MatchAll()
)
) && +q.Terms(t => t
.Field("_index")
.Terms(new[] { "markets" })
)
)
);
此代码创建了查询
POST /sales,markets/_search
{
"from": 0,
"size": 10,
"explain": false,
"query": {
"bool": {
"should": [
{
"bool": {
"must": [
{
"nested": {
"query": {
"match_all": {}
},
"path": "comments",
"inner_hits": {
"size": 1
},
"ignore_unmapped": true
}
}
],
"filter": [
{
"terms": {
"_index": [
"sales"
]
}
}
]
}
},
{
"bool": {
"must": [
{
"nested": {
"query": {
"match_all": {}
},
"path": "products",
"inner_hits": {
"size": 1
},
"ignore_unmapped": true
}
}
],
"filter": [
{
"terms": {
"_index": [
"markets"
]
}
}
]
}
}
]
}
}
}
再次出现错误
{
"error": {
"root_cause": [
{
"type": "illegal_state_exception",
"reason": "[match_all] no mapping found for type [comments]"
},
{
"type": "illegal_state_exception",
"reason": "[match_all] no mapping found for type [products]"
}
],
"type": "search_phase_execution_exception",
"reason": "all shards failed",
"phase": "query",
"grouped": true,
"failed_shards": [
{
"shard": 0,
"index": "markets",
"node": "-22psoQNRLa8_Y9GeHBXaw",
"reason": {
"type": "illegal_state_exception",
"reason": "[match_all] no mapping found for type [comments]"
}
},
{
"shard": 0,
"index": "sales",
"node": "-22psoQNRLa8_Y9GeHBXaw",
"reason": {
"type": "illegal_state_exception",
"reason": "[match_all] no mapping found for type [products]"
}
}
]
},
"status": 500
}
答案 0 :(得分：0)
正如你所说，NEST中似乎缺少inner_hits属性;我现在打开一个问题，将其添加到下一个版本中。
ignore_unmapped是在需要inner_hits时处理此问题的方法。如果您不需要inner_hits，则可以将每个嵌套查询与term元数据字段上的"_index"查询相结合，在每种情况下定位相应的索引名称，以便嵌套查询仅针对包含目标字段的索引运行。
答案 1 :(得分：0)
此问题已在两个地方修复，并将在NEST或ElasticSearch的某些未来版本中提供。
IgnoreUnmapped()方法，NEST .net库。 https://github.com/elastic/elasticsearch-net/issues/3132
通过ignore_unmapped中的嵌套查询inner_hits属性继承ignore_unmapped进行弹性搜索
https://github.com/elastic/elasticsearch/issues/29071