# Need help In Function Scoring
**URL:** https://discuss.elastic.co/t/need-help-in-function-scoring/55825
**Category:** Elasticsearch
**Created:** [July 19, 2016, 6:17am UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825 "2016-07-19T06:17:18Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@Nisar\_Adappadathil](https://discuss.elastic.co/u/Nisar_Adappadathil)
#### Post date: [July 19, 2016, 6:17am UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825/1 "2016-07-19T06:17:19Z")
POST: [http://localhost:9200/myindex/type/\_search](http://localhost:9200/myindex/type/_search)
{
"query": {
"function\_score": {
"functions": [
{
"gauss": {
"b": {
"origin": "0",
"scale": "1000"
}
}, "weight":"2"
}
],
"query": {
"match": {"b":656}
},
"score\_mode": "multiply"
}
}
}
I have 2 fields in my doc a:string and b:number
So I was trying various ways to change scoring pattern.
Requirement: I need to have the score based on only coord and not on tf-idf.
Example: If my query is "location":"bangalore" OR "location":"chennai" OR "location":"mumbai"
So If a record contains all the matches, it should come on top, then a document with less number of matches like that.
So the scoring should respect coord only and not tf-idf. How can i achieve this.
From lucene documentation this is the scoring logic:
score(q,d) = coord(q,d) · queryNorm(q) · ∑( tf(t in d)· idf(t)2 · t.getBoost()· norm(t,d))
---
### Author:  [@gabriel\_tessier](https://discuss.elastic.co/u/gabriel_tessier)
#### Post date: [July 19, 2016, 7:05am UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825/2 "2016-07-19T07:05:34Z")
Hi,
If your list of location is static you can go with a hand made field location\_score and you can set points if the location match.
In your case if your document have the location "bangalore" set the location\_score to 2.
i.e set the scoring logic before saving your document, so on query you only need to sort.
---
### Author:  [@Nisar\_Adappadathil](https://discuss.elastic.co/u/Nisar_Adappadathil)
#### Post date: [July 19, 2016, 9:00am UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825/3 "2016-07-19T09:00:00Z")
Thanks for your help.
In my scenario its the number of matches which i am taking into consideration
If my document has location bangalore,chennai,mumbai the there are 3 matches..It should come on the top.
If my document has location bangalore,chennai the there are 2 matches..It should come below the one with 3 matches..
Its like this
Is there a way to do this.
---
### Author:  [@gabriel\_tessier](https://discuss.elastic.co/u/gabriel_tessier)
#### Post date: [July 19, 2016, 10:08am UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825/4 "2016-07-19T10:08:31Z")
Hi,
I don't know enough about your data, but I can guess if you have documents like this ones:
{"id": 1, "location": ["bangalore", "chennai"], ...}
{"id": 2, "location": ["bangalore", "bollywood"], ...}
{"id": 3, "location": ["bollywood"], ...}
before saving your document you need to check your location and add points so it will give:
{"id": 1, "location": ["bangalore", "chennai"], "location\_score": 4} \<--- 4 because 2 points by correct location
{"id": 2, "location": ["bangalore", "bollywood"], "location\_score": 2} \<--- 2 because there's only one good location
{"id": 3, "location": ["bollywood"], "location\_score": 0} \<--- 0 because bollywood is not in the list of good location
So if you sort by "location\_score" you'll get your data in the correct order.
---
### Author:  [@Nisar\_Adappadathil](https://discuss.elastic.co/u/Nisar_Adappadathil)
#### Post date: [July 19, 2016, 10:36am UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825/5 "2016-07-19T10:36:05Z")
**my query is "location":"bangalore" OR "location":"chennai" OR "location":"mumbai"**
I can't put a new field in my document (location\_score) because the number of match i am saing is based on the query.
In this case how many conditions of the query is matched with the document.
If my document is like:
Doc21: { location :["bangalore","chennai","mumbai","london"] } // for the given query there are 3 matches
for document Doc2:{ location :["bangalore","chennai","berlin","paris"] }// for the given query there are 2 matches
so here the scoring should be based on the number of matches. So Doc1 will come above Doc2.
If my query was "location":"bangalore" OR "location":"chennai" OR "location":"berlin"
here Doc2 will come on top.
This is the requirement.
---
### Author:  [@gabriel\_tessier](https://discuss.elastic.co/u/gabriel_tessier)
#### Post date: [July 20, 2016, 3:44am UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825/6 "2016-07-20T03:44:03Z")
Hi,
Does this match your requirements:
# create the docuemnts
```
curl -XPOST 127.0.0.1:9200/test_city/city_score/1 -d '{"id":1, "location":["bangalore", "paris", "mumbai"]}'
curl -XPOST 127.0.0.1:9200/test_city/city_score/2 -d '{"id":2, "location":["bangalore", "paris"]}'
```
# terms query with sort on \_score
`curl -XPOST 127.0.0.1:9200/test_city/city_score/_search -d '{"query":{"terms":{"location":["bangalore":mumbai]}}, "sort":"_score"}'`
it return:
`{"took":10,"timed_out":false,"_shards":{"total":1,"successful":1,"failed":0},"hits":{"total":2,"max_score":0.581694,"hits":[{"_index":"test_city","_type":"city_score","_id":"1","_score":0.581694, "_source" : {"id":1, "location":["bangalore", "paris", "mumbai"]}},{"_index":"test_city","_type":"city_score","_id":"2","_score":0.09494676, "_source" : {"id":2, "location":["bangalore", "paris"]}}]}}`
Doc 1 have a better score: 0.581694
than doc2 0.09494676
---
### Author:  [@Nisar\_Adappadathil](https://discuss.elastic.co/u/Nisar_Adappadathil)
#### Post date: [July 20, 2016, 1:45pm UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825/7 "2016-07-20T13:45:00Z")
This will not work every time.
Doc1 : "location": ["bangalore", "paris", "mumbai", "kolkata"]
Doc2 : "location": ["bangalore", "paris","mumbai"]
Doc3 : "location": ["bangalore", "paris", "mumbai","calicut"]
Doc4 : "location": ["bangalore","paris"]
Doc5 : "location": ["bangalore","paris","bangalore","bangalore"]
Doc6 : location": ["bangalore", "mumbai", "kolkata"]
I have inserted these data.
Queried for this : {"query":{"terms":{"location":["bangalore","mumbai","calicut","kolkata","paris"] } }, "sort":"\_score"}
here the doc with 3 matches came above one with 4 matches.
Here Doc2 came above Doc3.
Result I got:
{
"took": 4,
"timed\_out": false,
"\_shards": {
"total": 5,
"successful": 5,
"failed": 0
},
"hits": {
"total": 5,
"max\_score": 1,
"hits": [
{
"\_index": "test\_city",
"\_type": "city\_score",
"\_id": "5",
"\_score": 1,
"\_source": {
"location": [
"bangalore",
"paris",
"mumbai",
"kolkata"
]
}
},
{
"\_index": "test\_city",
"\_type": "city\_score",
"\_id": "1",
"\_score": 1,
"\_source": {
"id": 1,
"location": [
"bangalore",
"paris",
"mumbai"
]
}
},
{
"\_index": "test\_city",
"\_type": "city\_score",
"\_id": "6",
"\_score": 1,
"\_source": {
"location": [
"bangalore",
"paris",
"mumbai",
"calicut"
]
}
},
{
"\_index": "test\_city",
"\_type": "city\_score",
"\_id": "2",
"\_score": 1,
"\_source": {
"id": 2,
"location": [
"bangalore",
"paris"
]
}
},
{
"\_index": "test\_city",
"\_type": "city\_score",
"\_id": "7",
"\_score": 1,
"\_source": {
"location": [
"bangalore",
"paris",
"bangalore",
"bangalore"
]
}
}
]
}
}
---
### Author:  [@gabriel\_tessier](https://discuss.elastic.co/u/gabriel_tessier)
#### Post date: [July 22, 2016, 6:13am UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825/8 "2016-07-22T06:13:21Z")
There's something strange in your result all your \_score are equal to 1???
in my test the score are different : \_score":0.581694", "\_score":0.09494676!!
---
### Author:  [@Nisar\_Adappadathil](https://discuss.elastic.co/u/Nisar_Adappadathil)
#### Post date: [July 22, 2016, 6:19am UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825/9 "2016-07-22T06:19:45Z")
[https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-constant-score-query.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-constant-score-query.html)
I have used constant\_query which says it'll ignore tf-idf and consider only coord.
I need to ignore this tf-idf some how and consider only coord.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 5, 2017, 10:33pm UTC](https://discuss.elastic.co/t/need-help-in-function-scoring/55825/10 "2017-07-05T22:33:32Z")