# IDF across fields

**URL:** <https://discuss.elastic.co/t/idf-across-fields/24745>\
**Category:** Elasticsearch\
**Created:** [July 1, 2015, 4:25pm UTC](https://discuss.elastic.co/t/idf-across-fields/24745 "2015-07-01T16:25:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Gayatri\_Nair](https://avatars.discourse-cdn.com/v4/letter/g/b5a626/32.png) [@Gayatri\_Nair](https://discuss.elastic.co/u/Gayatri_Nair)\
**Post date:** [July 1, 2015, 4:25pm UTC](https://discuss.elastic.co/t/idf-across-fields/24745/1 "2015-07-01T16:25:28Z")

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Is there a way to calculate IDF,( or more specifically the document frequency) across fields? Suppose fields A and B contain the term "xyz" 50 and 60 times respectively. can the document frequency of "xyz" be calculated such that it is equal to 50+60=110?  
Also, how can I disable IDF without disabling tf? I'm using default similarity.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 12:04am UTC](https://discuss.elastic.co/t/idf-across-fields/24745/2 "2017-07-06T00:04:09Z")

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