# How to apply Function Score in elastic search and remove old score
**URL:** https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429
**Category:** Elasticsearch
**Created:** [December 8, 2016, 11:48am UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429 "2016-12-08T11:48:09Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@Magapu\_Tatarao](https://discuss.elastic.co/u/Magapu_Tatarao)
#### Post date: [December 8, 2016, 11:48am UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429/1 "2016-12-08T11:48:09Z")
{
"size": 40,
"query": {
"function\_score": {
```
"query": {
"bool": {
"must": [
{
"match": {
"in_search": 1
}
},
{
"match": {
"prod_id_active": 1
}
},
{
"match": {
"search_title": "apple iphone 6s"
}
}
]
}
},
"functions": [
{
"filter": {
"match": {
"search_title": "apple iphone 6s"
}
},
"script_score": {
"params": {
"possibility_rank": 7,
"max_cat_rank": 5000,
"max_prod_rank": 10000,
"_score" : 0
},
"script": "_score + possibility_rank * (max_cat_rank + max_prod_rank)-(doc['category_rank'].value + doc['product_rank'].value)"
}
},
{
"filter": {
"match": {
"search_title": "apple iphone"
}
},
"script_score": {
"params": {
"possibility_rank": 6,
"max_cat_rank": 5000,
"max_prod_rank": 10000,
"_score" : 0
},
"script": "_score + possibility_rank * (max_cat_rank + max_prod_rank)-(doc['category_rank'].value + doc['product_rank'].value)"
}
},
{
"filter": {
"match": {
"search_title": "apple 6s"
}
},
"script_score": {
"params": {
"possibility_rank": 5,
"max_cat_rank": 5000,
"max_prod_rank": 10000,
"_score" : 0
},
"script": "_score + possibility_rank * (max_cat_rank + max_prod_rank)-(doc['category_rank'].value + doc['product_rank'].value)"
}
},
{
"filter": {
"match": {
"search_title": "iphone 6s"
}
},
"script_score": {
"params": {
"possibility_rank": 4,
"max_cat_rank": 5000,
"max_prod_rank": 10000,
"_score" : 0
},
"script": " _score + possibility_rank * (max_cat_rank + max_prod_rank)-(doc['category_rank'].value + doc['product_rank'].value)"
}
},
{
"filter": {
"match": {
"search_title": "apple"
}
},
"script_score": {
"params": {
"possibility_rank": 3,
"max_cat_rank": 5000,
"max_prod_rank": 10000,
"_score" : 0
},
"script": "_score + possibility_rank * (max_cat_rank + max_prod_rank)-(doc['category_rank'].value + doc['product_rank'].value)"
}
},
{
"filter": {
"match": {
"search_title": "iphone"
}
},
"script_score": {
"params": {
"possibility_rank": 2,
"max_cat_rank": 5000,
"max_prod_rank": 10000,
"_score" : 0
},
"script": " _score + possibility_rank * (max_cat_rank + max_prod_rank)-(doc['category_rank'].value + doc['product_rank'].value)"
}
},
{
"filter": {
"match": {
"search_title": "6s"
}
},
"script_score": {
"params": {
"possibility_rank": 1,
"max_cat_rank": 5000,
"max_prod_rank": 10000,
"_score" : 0
},
"script": " _score + possibility_rank * (max_cat_rank + max_prod_rank)-(doc['category_rank'].value + doc['product_rank'].value)"
}
}
],
"score_mode": "sum"
}
```
}
}
---
### Author:  [@colings86](https://discuss.elastic.co/u/colings86)
#### Post date: [December 8, 2016, 11:58am UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429/2 "2016-12-08T11:58:22Z")
It seems like you are looking for the `"boost_mode": "replace"` option which will replace the score calculated from Lucene with the score you calculate in your function score. see [https://www.elastic.co/guide/en/elasticsearch/reference/5.0/query-dsl-function-score-query.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.0/query-dsl-function-score-query.html) for more details
---
### Author:  [@Magapu\_Tatarao](https://discuss.elastic.co/u/Magapu_Tatarao)
#### Post date: [December 8, 2016, 12:05pm UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429/3 "2016-12-08T12:05:22Z")
@colings86
thanks for your reply
I am using "function\_score" here with my custom formula
it is working fine but , the score is applying with the all scores of that particular document
so before that i want to make my doc score to 0 and apply the score calculated by my function
---
### Author:  [@colings86](https://discuss.elastic.co/u/colings86)
#### Post date: [December 8, 2016, 12:11pm UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429/4 "2016-12-08T12:11:22Z")
As I said, it sounds like you just need to add `"boost_mode": "replace"` to your function\_score which will ignore the score that is calculated outside of the function score. If you are wanting only one of the functions in you function score to calculate the score then you will need to change the `score_mode` from `sum` to some other value e.g. `first`
---
### Author:  [@Magapu\_Tatarao](https://discuss.elastic.co/u/Magapu_Tatarao)
#### Post date: [December 8, 2016, 12:18pm UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429/5 "2016-12-08T12:18:20Z")
check with both of your suggestions
and checked with ? explain tag in kibana
the actual score generated by my function for document is 104878
but it is showing by adding all other scores of a document
it is showing
"\_score" : 554572.06
for "score\_mode": "first"
and
"\_score": 2216353,
for "score\_mode": "sum"
please help where i am missing it
---
### Author:  [@Magapu\_Tatarao](https://discuss.elastic.co/u/Magapu_Tatarao)
#### Post date: [December 8, 2016, 12:25pm UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429/6 "2016-12-08T12:25:34Z")
@colings86
Wow Thanks for your help ,
I have applied both statements given by u collectively
and achieved what i need
now the scoring function getting the result
\_score = 104972
and score also getting same \_score = 104972
Thanks!
---
### Author:  [@Magapu\_Tatarao](https://discuss.elastic.co/u/Magapu_Tatarao)
#### Post date: [December 8, 2016, 12:42pm UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429/7 "2016-12-08T12:42:27Z")
@colings86
small isssue is there,
it changed the order of results
---
### Author:  [@Magapu\_Tatarao](https://discuss.elastic.co/u/Magapu_Tatarao)
#### Post date: [December 8, 2016, 12:50pm UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429/8 "2016-12-08T12:50:49Z")
all are taking the first function for score allocation all are taking values from first function all are taking possibility rank "possibility\_rank": 7 for calculating score
"functions": [
{
"filter": {
"match": {
"search\_title": "apple iphone 6s"
}
},
"script\_score": {
"params": {
"possibility\_rank": 7,
"max\_cat\_rank": 5000,
"max\_prod\_rank": 10000,
"\_score" : 0
},
"script": "\_score + possibility\_rank \* (max\_cat\_rank + max\_prod\_rank)-(doc['category\_rank'].value + doc['product\_rank'].value)"
}
},
{
"filter": {
"match": {
"search\_title": "apple iphone"
}
},
"script\_score": {
"params": {
"possibility\_rank": 6,
"max\_cat\_rank": 5000,
"max\_prod\_rank": 10000,
"\_score" : 0
},
"script": "\_score + possibility\_rank \* (max\_cat\_rank + max\_prod\_rank)-(doc['category\_rank'].value + doc['product\_rank'].value)"
}
},
{
"filter": {
"match": {
"search\_title": "apple 6s"
}
},
"script\_score": {
"params": {
"possibility\_rank": 5,
"max\_cat\_rank": 5000,
"max\_prod\_rank": 10000,
"\_score" : 0
},
"script": "\_score + possibility\_rank \* (max\_cat\_rank + max\_prod\_rank)-(doc['category\_rank'].value + doc['product\_rank'].value)"
}
}
---
### Author:  [@Magapu\_Tatarao](https://discuss.elastic.co/u/Magapu_Tatarao)
#### Post date: [December 15, 2016, 5:53am UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429/9 "2016-12-15T05:53:03Z")
Hi i was stuck out there !!. replacing the document relevant score with the score calculated by function,
can any one have suggestions on this please let me know.
Thanks in advance
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 12, 2017, 5:53am UTC](https://discuss.elastic.co/t/how-to-apply-function-score-in-elastic-search-and-remove-old-score/68429/10 "2017-01-12T05:53:08Z")
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