How to give different weights to exact, phonetic and fuzzy queries? - elasticsearch

Question

Note: I checked out this answer, but could not solve the problem.
So currently I am using the following query:
{
"_source": [
"title",
"bench",
"id_",
"court",
"date"
],
"size": 15,
"from": 0,
"query": {
"bool": {
"must": {
"multi_match": {
"query": "knife",
"fields": [
"title",
"body"
],
"operator": "and"
}
},
"should": {
"multi_match": {
"query": "knife",
"fields": [
"title",
"body"
],
"fuzziness" : 1,
"operator": "and"
}
}
}
},
"highlight": {
"pre_tags": [
"<tag1>"
],
"post_tags": [
"</tag1>"
],
"fields": {
"content": {}
},
"fragment_size": 30
}
}
What I want to achieve is that I want to give different weights to exact, phonetic and fuzy queries in the order exact > fuzzy > phonetic. How do I acheive this?
This is my mapping - (My analyzer is a Metaphone analyzer)
{
"courts_2": {
"mappings": {
"properties": {
"author": {
"type": "text",
"analyzer": "my_analyzer"
},
"bench": {
"type": "text",
"analyzer": "my_analyzer"
},
"citation": {
"type": "text"
},
"content": {
"type": "text",
"fields": {
"standard": {
"type": "text"
}
},
"analyzer": "my_analyzer"
},
"court": {
"type": "text"
},
"date": {
"type": "text"
},
"id_": {
"type": "text"
},
"title": {
"type": "text",
"fields": {
"standard": {
"type": "text"
}
},
"analyzer": "my_analyzer"
},
"verdict": {
"type": "text"
}
}
}
}
}

Answer 1

You might index phonetic fields on an separate sub-field as follow :
"mappings": {
"properties": {
"title": {
"type": "text",
"fields": {
"phonetic": {
"type": "text",
"analyzer": "my_analyzer"
}
}}}}
Then, you can do a Function score query to have the order exact > fuzzy > phonetic :
{
"_source": [
"title",
"bench",
"id_",
"court",
"date"
],
"size": 15,
"from": 0,
"query": {
"bool": {
"should": [
{
"function_score": {
"query": {
"multi_match": {
"query": "knife",
"fields": [
"title",
"body"
],
"operator": "and"
}
},
"boost": 3
}
},
{
"function_score": {
"query": {
"multi_match": {
"query": "knife",
"fields": [
"title",
"body"
],
"fuzziness": 1,
"operator": "and"
}
},
"boost": 2
}
},
{
"function_score": {
"query": {
"multi_match": {
"query": "knife",
"fields": [
"title.phonetic",
"body.phonetic"
],
"operator": "and"
}
},
"boost": 1
}
}
]
}
}
}
Hope this helps !