# Custom scoring using IDF of \_all field?
**URL:** https://discuss.elastic.co/t/custom-scoring-using-idf-of--all-field/40189
**Category:** Elasticsearch
**Created:** [January 27, 2016, 5:53am UTC](https://discuss.elastic.co/t/custom-scoring-using-idf-of--all-field/40189 "2016-01-27T05:53:31Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@gihan](https://discuss.elastic.co/u/gihan)
#### Post date: [January 27, 2016, 5:53am UTC](https://discuss.elastic.co/t/custom-scoring-using-idf-of--all-field/40189/1 "2016-01-27T05:53:31Z")
We are querying 3 fields of a document using multi\_match with best\_fields. The 3 fields are also included in \_all. I'm using a custom Similarity class which currently defaults the IDF value to 1. How can I use the true IDF value of the \_all field as the IDF value of the remaining 3 fields?
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### Author:  [@whybangbang](https://discuss.elastic.co/u/whybangbang)
#### Post date: [January 27, 2016, 6:33am UTC](https://discuss.elastic.co/t/custom-scoring-using-idf-of--all-field/40189/2 "2016-01-27T06:33:11Z")
maybe you can look this page,elasticsearch can controll TF/IDF open or close
[https://www.elastic.co/guide/en/elasticsearch/guide/current/scoring-theory.html](https://www.elastic.co/guide/en/elasticsearch/guide/current/scoring-theory.html)
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 5, 2017, 11:21pm UTC](https://discuss.elastic.co/t/custom-scoring-using-idf-of--all-field/40189/3 "2017-07-05T23:21:13Z")