Problem with Elasticsearch querying nested documents - ruby-on-rails

Question

I am learning ES and I am having problems with this query:
Given 2 products:
products/_source/1
{
"product_id": "58410-2",
"name": [
{
"locale": "en",
"translation": "CBC panel"
},
{
"locale": "vn",
"translation": "CBC panel VN"
}
],
"status": "active",
"category": {
"id": 8,
"name": [
{
"locale": "en",
"translation": "Hematology"
},
{
"locale": "vn",
"translation": "huyết học"
}
]
},
"children": [
{
"product_id": "6690-2",
"name": [
{
"locale": "en",
"translation": "Leukocytes"
},
{
"locale": "vn",
"translation": "Leukocytes vn"
}
],
"status": "active",
"category": {
"id": 8,
"name": [
{
"locale": "en",
"translation": "Hematology"
},
{
"locale": "vn",
"translation": "huyết học"
}
]
},
"children": []
}]}
and
products/_source/2
{
"product_id": "6690-2",
"name": [
{
"locale": "en",
"translation": "Leukocytes"
},
{
"locale": "vn",
"translation": "Leukocytes vn"
}
],
"status": "active",
"category": {
"id": 8,
"name": [
{
"locale": "en",
"translation": "Hematology"
},
{
"locale": "vn",
"translation": "huyết học"
}
]
},
"children": []
}
where a product is a single document but also can be nested in a children array of other products. Both products are different documents in the index.
and this index:
{
"products": {
"aliases": {},
"mappings": {
"dynamic": "false",
"properties": {
"category": {
"properties": {
"name": {
"properties": {
"locale": {
"type": "keyword"
},
"translation": {
"type": "text"
}
}
}
}
},
"children": {
"type": "nested"
},
"name": {
"properties": {
"locale": {
"type": "keyword"
},
"translation": {
"type": "text"
}
}
},
"product_id": {
"type": "keyword"
},
"status": {
"type": "keyword"
}
}
},
"settings": {
"index": {
"routing": {
"allocation": {
"include": {
"_tier_preference": "data_content"
}
}
},
"number_of_shards": "3",
"provided_name": "products",
"number_of_replicas": "1"
}
}
}
}
I want to be able to query for "Leuko" (or the category or the product_id) and retrieve both products, the single product and the root product.
I have tried using object field, nested, flattened but I think the problem is I don't know how to properly write the query, I have tried things like this (I am using a ruby library but I think it is easy to follow):
#query = {
query: {
query_string: {
fields: ['name.translation', 'children.name.translation', 'category.name.translation', 'children.product_id'],
query: "*#{text}*"
}
},
size: 50
}
#query = {
query: {
nested: {
path: 'children',
query: {
bool: {
should: [
term: { 'children.name.translation' => "*#{text}*" },
term: { 'name.translation' => "*#{text}*" }
]
}
}
}
}
}
but I think at some point I dunno what I am doing anymore and I am just randomly trying different stuff from the documentation.

Answer 1

Follow my query suggestion. Note that I had to add the fields in the Nested object to the mapping.
Mapping:
{
"mappings": {
"dynamic": "false",
"properties": {
"category": {
"properties": {
"name": {
"properties": {
"locale": {
"type": "keyword"
},
"translation": {
"type": "text"
}
}
}
}
},
"children": {
"type": "nested",
"properties": {
"product_id": {
"type": "keyword"
},
"category": {
"properties": {
"name": {
"properties": {
"locale": {
"type": "keyword"
},
"translation": {
"type": "text"
}
}
}
}
},
"name": {
"properties": {
"locale": {
"type": "keyword"
},
"translation": {
"type": "text"
}
}
},
"status": {
"type": "keyword"
}
}
},
"name": {
"properties": {
"locale": {
"type": "keyword"
},
"translation": {
"type": "text"
}
}
},
"product_id": {
"type": "keyword"
},
"status": {
"type": "keyword"
}
}
}
}
Query:
{
"query": {
"bool": {
"minimum_should_match": 1,
"should": [
{
"nested": {
"path": "children",
"query": {
"wildcard": {
"children.name.translation": "leuko*"
}
}
}
},
{
"wildcard": {
"name.translation": "leuko*"
}
}
]
}
}
}
hint
See that you use translation. Avoid using array to make your queries simpler.
What I would do in your case is to create a field for each language, this makes the use of analyzer more flexible for each type of language and you stop using an array and work with an object.
PUT test
{
"mappings": {
"properties": {
"name":{
"type": "text",
"fields": {
"es":{
"type": "text",
"analyzer":"english"
},
"vn":{
"type": "text"
}
}
}
}
}
}
POST test/_doc/
{
"name": "Leukocytes"
}
An example query using field languages.
GET test/_search
{
"query": {
"multi_match": {
"query": "Leukocytes",
"fields": ["name.es", "name.vn"]
}
}
}