# How to change 'termFreq' in BM25?
**URL:** https://discuss.elastic.co/t/how-to-change-termfreq-in-bm25/212302
**Category:** Elasticsearch
**Created:** [December 18, 2019, 10:32am UTC](https://discuss.elastic.co/t/how-to-change-termfreq-in-bm25/212302 "2019-12-18T10:32:04Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Ricardo\_Z](https://discuss.elastic.co/u/Ricardo_Z)
#### Post date: [December 18, 2019, 10:32am UTC](https://discuss.elastic.co/t/how-to-change-termfreq-in-bm25/212302/1 "2019-12-18T10:32:05Z")
Hello,
I use elasticsearch 5.6.
I am trying to reconstruct the Okapi BM25 default similarity in Elasticsearch.
Some of our document have repeat words in the database, such as "you are a good boy boy boy".
so, the 'termFreq' of the 'boy' word in BM25 is 3 when computing score. I want to set this to 1.
I found to use 'index\_options=docs" could disable term frequency, but the "avgFieldLength" was changed to 1 too.
How can I only change 'termFreq'?
Thanks for any help.
Ricardo
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### Author:  [@Ricardo\_Z](https://discuss.elastic.co/u/Ricardo_Z)
#### Post date: [December 23, 2019, 11:52am UTC](https://discuss.elastic.co/t/how-to-change-termfreq-in-bm25/212302/2 "2019-12-23T11:52:42Z")
can anybody answer my question?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 20, 2020, 11:52am UTC](https://discuss.elastic.co/t/how-to-change-termfreq-in-bm25/212302/3 "2020-01-20T11:52:47Z")
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