elastic search for mark character - elasticsearch

Question

I have two fields in Vietnamese: "mắt biếc" and "mật mã" in an index call books.
In books index, i use accifolding to transform from "mắt biếc" to "mat biec" and "mật mã" to "mat ma".
In two fields above, i need to query for a term : "mắt". But the score of two field is equal and what i want is "mắt biếc" have score greater than "mật mã".
So, how can i do that in elastic search.

Answer 1

You should use Function Score Query
Try this (base on version 7.x):
GET my_index/_search
{
"query": {
"function_score": {
"query": {
"match": {
"title": "mật"
}
},
"functions": [
{
"filter": {
"term": {
"title.keyword": {
"value": "mắt biếc"
}
}
},
"weight": 30
}
],
"max_boost": 30,
"score_mode": "max",
"boost_mode": "multiply"
}
}
}
Mappings example
PUT my_index
{
"settings": {
"analysis": {
"analyzer": {
"product_analyzer": {
"tokenizer": "standard",
"filter": [
"asciifolding"
]
}
}
}
},
"mappings": {
"properties": {
"title": {
"type": "text",
"analyzer": "product_analyzer",
"fields": {
"keyword": {
"type": "keyword"
}
}
},
"price": {
"type": "keyword"
},
"author": {
"type": "keyword"
},
"publisher": {
"type": "keyword"
}
}
}
}
You have to update your mappings in order to use title.keyword
Update Query
POST my_index/_mapping
{
"properties": {
"title": {
"type": "text",
"analyzer": "product_analyzer",
"fields": {
"keyword": {
"type": "keyword"
}
}
}
}
}
And then
Update all documents
POST my_index/_update_by_query?conflicts=proceed
Hope this helps