ElasticSearch won't search specific field - elasticsearch

Question

I have a problem searching a specific field inside my index.
little background:
On my project we need to search inside a terminology Server like FHIR but then our own.
So we have an object that contains a Code (123564/A), multiple translations as term/display (urine problem) and mapping to other codes that are equal to that code but in a different system (ICD-10, SNOMED-CT, ICPC-2,..) example what has been indexed:
{
"Code": "10008220/A1",
"EffectiveTime": "0001-01-01T00:00:00Z",
"Active": true,
"System": "ibui",
"Purpose": "",
"Descriptions": [
{
"DescriptionId": "2464cf5c-d4fc-4a61-b6bc-746d003cb4ef",
"Code": "10008220/A1",
"System": "ibui",
"Term": "gebroken arm",
"LanguageId": "3d50c237-0add-43e7-92a2-5edf1ac7c6ee",
"FSN": false,
"Preferred": true,
"EffectiveTime": "0001-01-01T00:00:00Z",
"Active": true,
"SendVersion": "2021-12-07T17:01:53.786755Z",
"Purpose": ""
},
{
"DescriptionId": "95501583-9f24-4964-bbc9-1a6e95eba30f",
"Code": "10008220/A1",
"System": "ibui",
"Term": "fracture du bras",
"LanguageId": "1238dde0-08df-4ae0-8676-59919f66737e",
"FSN": false,
"Preferred": true,
"EffectiveTime": "0001-01-01T00:00:00Z",
"Active": true,
"SendVersion": "2021-12-07T17:01:53.786755Z",
"Purpose": ""
}
],
"Mappings": [
{
"MappingId": "",
"FromSys": "ibui",
"From": "10008220/A1",
"ToSys": "icd-10",
"To": "T10",
"EffectiveTime": "0001-01-01T00:00:00Z",
"Active": true
},
{
"MappingId": "",
"FromSys": "ibui",
"From": "10008220/A1",
"ToSys": "icpc-2",
"To": "L76",
"EffectiveTime": "0001-01-01T00:00:00Z",
"Active": true
}
],
"SendVersion": "2021-12-07T17:01:53.786755Z"
}
The problem:
We can search on 2 different fields : Code & Term. and when searching we keep in mind that we have some filters for a specific language code (Dutch,..) or A system like ICD-10 or ICPC-2,..
I have a query that is working and returns the above object when searching in 1 field (Descriptions.Term) that is the following:
working query
{
"query": {
"bool": {
"must": {
"nested": {
"inner_hits": {
"highlight": {
"fields": {
"*": {}
}
}
},
"path": "Descriptions",
"query": {
"bool": {
"should": [
{
"multi_match": {
"fields": [
"Descriptions.Term",
"Descriptions.Term._2gram",
"Descriptions.Term._3gram"
],
"query": "gebroken*~ n",
"type": "bool_prefix"
}
}
],
"filter": [
{
"bool": {
"should": [
{
"term": {
"Descriptions.System": "ibui"
}
},{
"term": {
"Descriptions.System": "icd-10"
}
},{
"term": {
"Descriptions.System": "icpc-2"
}
}
],
"minimum_should_match": "1"
}
},
{
"term": {
"Descriptions.Active": "true"
}
},
{
"term": {
"Descriptions.LanguageId": "3d50c237-0add-43e7-92a2-5edf1ac7c6ee"
}
}
]
}
}
}
}
}
}
}
But when we somethings need to search in multiple fields.
When adding the Descriptions.Code field to the fields map the query is not working and I can't figure out why. I have it decleared inside my mapping so it should be searchable?
I'm searching for the Code of the object above in both fields (Descriptions.Term & Descriptions.Code) but it doesn't returns the hit.
not working query
{
"query": {
"bool": {
"must": {
"nested": {
"inner_hits": {
"highlight": {
"fields": {
"*": {}
}
}
},
"path": "Descriptions",
"query": {
"bool": {
"should": [
{
"multi_match": {
"fields": [
"Descriptions.Term",
"Descriptions.Term._2gram",
"Descriptions.Term._3gram",
"Descriptions.Code"
],
"query": "10008220*~ n",
"type": "bool_prefix"
}
}
],
"filter": [
{
"bool": {
"should": [
{
"term": {
"Descriptions.System": "ibui"
}
},{
"term": {
"Descriptions.System": "icd-10"
}
},{
"term": {
"Descriptions.System": "icpc-2"
}
}
],
"minimum_should_match": "1"
}
},
{
"term": {
"Descriptions.Active": "true"
}
},
{
"term": {
"Descriptions.LanguageId": "3d50c237-0add-43e7-92a2-5edf1ac7c6ee"
}
}
]
}
}
}
}
}
}
}
mapping:
{
"settings": {
"number_of_shards": 1,
"analysis": {
"analyzer": {
"autocomplete": {
"tokenizer": "custom_tokenizer"
}
},
"tokenizer": {
"custom_tokenizer": {
"type": "ngram",
"min_gram": 2,
"max_gram": 6,
"token_chars": [
"letter",
"digit",
"symbol",
"punctuation"
]
}
}
},
"max_ngram_diff" : "5"
},
"mappings": {
"properties": {
"Descriptions": {
"type": "nested",
"properties": {
"Term": {
"type": "search_as_you_type",
"analyzer": "autocomplete"
},
"Code": {
"type": "keyword",
"index": true
},
"System": {
"type": "keyword",
"index": true
},
"LanguageId": {
"type": "keyword",
"index": true
},
"Purpose": {
"type": "keyword",
"index": true
},
"Active": {
"type": "keyword",
"index": true
}
}
},
"Mappings": {
"properties": {
"To": {
"type": "keyword",
"index": true
},
"ToSys": {
"type": "keyword",
"index": true
}
}
}
}
}
}
Thank you for helping me out!