How to add a user defined field and value to an elasticsearch query - elasticsearch

Question

Goal: I want a query which adds a discriminator field to distinguish between fuzzy results and non-fuzzy results.
Consider these documents:
curl -X POST "localhost:9200/_bulk" -H 'Content-Type: application/json' -d'
{
"index": {
"_index": "dishes",
"_type": "dish",
"_id": "1"
}
}
{
"name": "butter chicken"
}
{
"index": {
"_index": "dishes",
"_type": "dish",
"_id": "2"
}
}
{
"name": "chicken burger"
}
'
Consider the following query:
curl -X POST "localhost:9200/dishes/_search?pretty" -H 'Content-Type: application/json' -d'
{
"query": {
"bool": {
"should": [
{
"term": {
"name": "burger"
}
},
{
"fuzzy": {
"name": {
"value": "burger"
}
}
}
],
"minimum_should_match": 1,
"boost": 1.0
}
}
}
'
Can I have a result with an additional tag created during query (it is not in the document) that can be used to discriminate between what is a fuzzy result and what is a non-fuzzy result.
...
"hits" : [
{
"_index" : "dishes",
"_type" : "dish",
"_id" : "2",
"_score" : 1.3862942,
"_source" : {
"name" : "chicken burger"
},
"is_fuzzy": false
},
{
"_index" : "dishes",
"_type" : "dish",
"_id" : "1",
"_score" : 0.46209806,
"_source" : {
"name" : "butter chicken"
},
"is_fuzzy": true
}
]
Scripted fields could have been ideal. But no luck yet.
I have a requirement to present the non-fuzzy results before fuzzy results. So sorting on is_fuzzy and then _score is guaranteed to work. (The actual query is more complex.)
sort: [
{
"is_fuzzy": {
"order": "desc"
}
},
{
"_score": {
"order": "desc"
}
}

Answer 1

One more option is to use named queries but your term filters will need to be slightly reworked:
GET dishes/_search
{
"query": {
"bool": {
"should": [
{
"term": {
"name": {
"value": "burger",
"_name": "not_fuzzy"
}
}
},
{
"fuzzy": {
"name": {
"value": "burger",
"_name": "fuzzy"
}
}
}
],
"minimum_should_match": 1,
"boost": 1
}
}
}
yielding
[
{
"_index":"dishes",
"_type":"dish",
"_id":"2",
"_score":1.3862944,
"_source":{
"name":"chicken burger"
},
"matched_queries":[ <---
"fuzzy",
"not_fuzzy"
]
},
{
"_index":"dishes",
"_type":"dish",
"_id":"1",
"_score":0.46209806,
"_source":{
"name":"butter chicken"
},
"matched_queries":[ <---
"fuzzy"
]
}
]