# X-pack5.4 advanced job field\_name cannot be used with function 'rare'

**URL:** <https://discuss.elastic.co/t/x-pack5-4-advanced-job-field-name-cannot-be-used-with-function-rare/87235>\
**Category:** Elasticsearch\
**Created:** [May 26, 2017, 10:11am UTC](https://discuss.elastic.co/t/x-pack5-4-advanced-job-field-name-cannot-be-used-with-function-rare/87235 "2017-05-26T10:11:42Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![19e5057b4cab9cf379c9](https://avatars.discourse-cdn.com/v4/letter/1/2bfe46/32.png) [@19e5057b4cab9cf379c9](https://discuss.elastic.co/u/19e5057b4cab9cf379c9)\
**Post date:** [May 26, 2017, 10:11am UTC](https://discuss.elastic.co/t/x-pack5-4-advanced-job-field-name-cannot-be-used-with-function-rare/87235/1 "2017-05-26T10:11:42Z")

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hey,gays

i'm trying to create advanced job with kibana-Machine Learning.

when i add detector, function choosing 'rare' and file\_name type is 'keyword' then

get error message:

[illegal\_argument\_exception] field\_name cannot be used with function 'rare'

anyone can fix this? i need help.

 ![](https://us1.discourse-cdn.com/elastic/original/3X/4/0/401e2780f9a698f57c6e1733adb463ffef3daa0d.png)

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**Author:** ![dmitri](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dmitri/32/17997_2.png) [@dmitri](https://discuss.elastic.co/u/dmitri)\
**Post date:** [May 26, 2017, 10:30am UTC](https://discuss.elastic.co/t/x-pack5-4-advanced-job-field-name-cannot-be-used-with-function-rare/87235/2 "2017-05-26T10:30:40Z")

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The "rare" function does not support having a "field\_name" as it is not a metric function; it does not apply calculations over numerical values of a "field\_name". You can find more information about "rare" in this page: [Rare Functions](https://www.elastic.co/guide/en/x-pack/current/ml-rare-functions.html)

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<div class="post-metadata">

**Author:** ![19e5057b4cab9cf379c9](https://avatars.discourse-cdn.com/v4/letter/1/2bfe46/32.png) [@19e5057b4cab9cf379c9](https://discuss.elastic.co/u/19e5057b4cab9cf379c9)\
**Post date:** [May 26, 2017, 10:35am UTC](https://discuss.elastic.co/t/x-pack5-4-advanced-job-field-name-cannot-be-used-with-function-rare/87235/3 "2017-05-26T10:35:11Z")

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thx! buddy

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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:** [June 23, 2017, 10:35am UTC](https://discuss.elastic.co/t/x-pack5-4-advanced-job-field-name-cannot-be-used-with-function-rare/87235/4 "2017-06-23T10:35:18Z")

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