Elasticsearch query fails to return results when querying a nested object - elasticsearch

Question

I have an object which looks something like this:
{
"id": 123,
"language_id": 1,
"label": "Pablo de la Pena",
"office": {
"count": 2,
"data": [
{
"id": 1234,
"is_office_lead": false,
"office": {
"id": 1,
"address_line_1": "123 Main Street",
"address_line_2": "London",
"address_line_3": "",
"address_line_4": "UK",
"address_postcode": "E1 2BC",
"city_id": 1
}
},
{
"id": 5678,
"is_office_lead": false,
"office": {
"id": 2,
"address_line_1": "77 High Road",
"address_line_2": "Edinburgh",
"address_line_3": "",
"address_line_4": "UK",
"address_postcode": "EH1 2DE",
"city_id": 2
}
}
]
},
"primary_office": {
"id": 1,
"address_line_1": "123 Main Street",
"address_line_2": "London",
"address_line_3": "",
"address_line_4": "UK",
"address_postcode": "E1 2BC",
"city_id": 1
}
}
My Elasticsearch mapping looks like this:
"mappings": {
"item": {
"properties": {
"office": {
"properties": {
"data": {
"type": "nested",
}
}
}
}
}
}
My Elasticsearch query looks something like this:
GET consultant/item/_search
{
"from": 0,
"size": 24,
"query": {
"bool": {
"must": [
{
"term": {
"language_id": 1
}
},
{
"term": {
"office.data.office.city_id": 1
}
}
]
}
}
}
This returns zero results, however, if I remove the second term and leave it only with the language_id clause, then it works as expected.
I'm sure this is down to a misunderstading on my part of how the nested object is flattened, but I'm out of ideas - I've tried all kinds of permutations of the query and mappings.
Any guidance hugely appreciated. I am using Elasticsearch 6.1.1.

Answer 1

I'm not sure if you need the entire record or not, this solution gives every record that has language_id: 1 and has an office.data.office.id: 1 value.
GET consultant/item/_search
{
"from": 0,
"size": 100,
"query": {
"bool":{
"must": [
{
"term": {
"language_id": {
"value": 1
}
}
},
{
"nested": {
"path": "office.data",
"query": {
"match": {
"office.data.office.city_id": 1
}
}
}
}
]
}
}
}
I put 3 different records in my test index for proofing against false hits, one with different language_id and one with different office ids and only the matching one returned.
If you only need the office data, then that's a bit different but still solvable.