Using named queries (matched_queries) for nested types in Elasticsearch? - elasticsearch

Question

Using named queries, I can get a list of the matched_queries for boolean expressions such as:
(query1) AND (query2 OR query3 OR true)
Here is an example of using named queries to match on top-level document fields:
DELETE test
PUT /test
PUT /test/_mapping/_doc
{
"properties": {
"name": {
"type": "text"
},
"type": {
"type": "text"
},
"TAGS": {
"type": "nested"
}
}
}
POST /test/_doc
{
"name" : "doc1",
"type": "msword",
"TAGS" : [
{
"ID" : "tag1",
"TYPE" : "BASIC"
},
{
"ID" : "tag2",
"TYPE" : "BASIC"
},
{
"ID" : "tag3",
"TYPE" : "BASIC"
}
]
}
# (query1) AND (query2 or query3 or true)
GET /test/_search
{
"query": {
"bool": {
"must": [
{
"match": {
"name": {
"query": "doc1",
"_name": "query1"
}
}
}
],
"should": [
{
"match": {
"type": {
"query": "msword",
"_name": "query2"
}
}
},
{
"exists": {
"field": "type",
"_name": "query3"
}
}
]
}
}
}
The above query correctly returns all three matched_queries in the response:
{
"took" : 1,
"timed_out" : false,
"_shards" : {
"total" : 5,
"successful" : 5,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : 1,
"max_score" : 1.5753641,
"hits" : [
{
"_index" : "test",
"_type" : "_doc",
"_id" : "TKNJ9G4BbvPS27u-ZYux",
"_score" : 1.5753641,
"_source" : {
"name" : "doc1",
"type" : "msword",
"TAGS" : [
{
"ID" : "ds1",
"TYPE" : "BASIC"
},
{
"ID" : "wb1",
"TYPE" : "BASIC"
}
]
},
"matched_queries" : [
"query1",
"query2",
"query3"
]
}
]
}
}
However, I'm trying to run a similar search:
(query1) AND (query2 OR query3 OR true)
only this time on the nested TAGS object rather than top-level document fields.
I've tried the following query, but the problem is I need to supply the inner_hits object for nested objects in order to get the matched_queries in the response, and I can only add it to one of the three queries.
GET /test/_search
{
"query": {
"bool": {
"must": {
"nested": {
"path": "TAGS",
"query": {
"match": {
"TAGS.ID": {
"query": "tag1",
"_name": "tag1-query"
}
}
},
// "inner_hits" : {}
}
},
"should": [
{
"nested": {
"path": "TAGS",
"query": {
"match": {
"TAGS.ID": {
"query": "tag2",
"_name": "tag2-query"
}
}
},
// "inner_hits" : {}
}
},
{
"nested": {
"path": "TAGS",
"query": {
"match": {
"TAGS.ID": {
"query": "tag3",
"_name": "tag3-query"
}
}
},
// "inner_hits" : {}
}
}
]
}
}
}
Elasticsearch will complain if I add more than one 'inner_hits'. I've commented out the places above where I can add it, but each of these will only return the single matched query.
I want my response to this query to return:
"matched_queries" : [
"tag1-query",
"tag2-query",
"tag3-query"
]
Any help is much appreciated, thanks!

Answer 1

A colleague helpfully provided a solution to this; move the _named parameter to directly under each nested section:
GET /test/_search
{
"query": {
"bool": {
"must": {
"nested": {
"_name": "tag1-query",
"path": "TAGS",
"query": {
"match": {
"TAGS.ID": {
"query": "tag1"
}
}
}
}
},
"should": [
{
"nested": {
"_name": "tag2-query",
"path": "TAGS",
"query": {
"match": {
"TAGS.ID": {
"query": "tag2"
}
}
}
}
},
{
"nested": {
"_name": "tag3-query",
"path": "TAGS",
"query": {
"match": {
"TAGS.ID": {
"query": "tag3"
}
}
}
}
}
]
}
}
}
This correctly returns all three tags now in the matched_queries response:
{
"took" : 1,
"timed_out" : false,
"_shards" : {
"total" : 5,
"successful" : 5,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : 1,
"max_score" : 2.9424875,
"hits" : [
{
"_index" : "test",
"_type" : "_doc",
"_id" : "TaNy9G4BbvPS27u--oto",
"_score" : 2.9424875,
"_source" : {
"name" : "doc1",
"type" : "msword",
"TAGS" : [
{
"ID" : "ds1",
"TYPE" : "DATASOURCE"
},
{
"ID" : "wb1",
"TYPE" : "WORKBOOK"
},
{
"ID" : "wb2",
"TYPE" : "WORKBOOK"
}
]
},
"matched_queries" : [
"tag1-query",
"tag2-query",
"tag3-query"
]
}
]
}
}