Filtering with deep nested items - elasticsearch

Question

I have the following mapping:
PUT /test
{
"mappings": {
"test": {
"properties": {
"parent": {
"type": "nested",
"properties": {
"#id": {
"type": "string",
"index": "not_analyzed"
},
"#type": {
"type": "string"
},
"child": {
"type": "nested",
"properties": {
"#id": {
"type": "string",
"index": "not_analyzed"
},
"subchild": {
"type": "nested",
"properties": {
"#id": {
"type": "string",
"index": "not_analyzed"
},
"hasA": {
"type": "nested",
"properties": {
"#value": {
"type": "string"
}
}
},
"hasB": {
"type": "nested",
"properties": {
"#id": {
"type": "string",
"index": "not_analyzed"
}
}
},
"hasC": {
"type": "nested",
"properties": {
"#id": {
"type": "string",
"index": "not_analyzed"
}
}
}
}
}
}
}
}
}
}
}
}
}
And the following document:
POST /test/test/1
{
"parent": {
"#id": "12345",
"#type": "test",
"child": [
{
"#id": "1",
"subchild": [
{
"#id": "1.1",
"hasA": {
"#value": "hasA value"
},
"hasB": {
"#id": "hasB_1"
},
"hasC": {
"#id": "hasC_1"
}
}
]
},
{
"#id": "2",
"subchild": [
{
"#id": "2.1",
"hasA": {
"#value": "hasA value"
},
"hasB": {
"#id": "hasB_2"
},
"hasC": {
"#id": "hasC_2"
}
}
]
}
]
}
}
And the following query:
POST test/test/_search
{
"query": {
"filtered": {
"query": {
"match_all": {}
},
"filter": {
"nested": {
"path": "parent.child.subchild.hasB",
"filter": {
"bool": {
"must": [
{
"term": {
"parent.child.subchild.hasB.#id": "hasB_2"
}
}
]
}
},
"_cache": false
}
}
}
}
}
I'm unable to set the path to just parent.child.subchild so that I can match on both hasB and hasC, it seems I can only select one nested item at a time. This is what I would like to be able to do:
POST test/test/_search
{
"query": {
"filtered": {
"query": {
"match_all": {}
},
"filter": {
"nested": {
"path": "parent.child.subchild",
"filter": {
"bool": {
"must": [
{
"term": {
"parent.child.subchild.hasB.#id": "hasB_2"
}
},
{
"term": {
"parent.child.subchild.hasC.#id": "hasC_2"
}
}
]
}
},
"_cache": false
}
}
}
}
}

Answer 1

Are you looking for something like this?
{
"query": {
"filtered": {
"query": {
"match_all": {}
},
"filter": {
"nested": {
"path": "parent.child.subchild",
"filter": {
"bool": {
"must": [
{
"nested": {
"path": "parent.child.subchild.hasB",
"query": {
"term": {
"parent.child.subchild.hasB.#id": "hasB_2"
}
}
}
},
{
"nested": {
"path": "parent.child.subchild.hasC",
"query": {
"term": {
"parent.child.subchild.hasC.#id": "hasC_2"
}
}
}
}
]
}
},
"_cache": false
}
}
}
}
}

Answer 2

Query for correct syntax for multi-level nested docs can be found here. Look at #martijnvg comments inside it.
ES Docs has not done a good job on explaining multi-level nested query.
Basically you need to nest subchild inside child inside parent and specify individual path. You will need three nested queries.
P.S - I have not tested this myself. Please let me know if it does not work.