# Get average of response time in specific interval

**URL:** https://discuss.elastic.co/t/get-average-of-response-time-in-specific-interval/50828
**Category:** Kibana
**Created:** [May 24, 2016, 11:14am UTC](https://discuss.elastic.co/t/get-average-of-response-time-in-specific-interval/50828 "2016-05-24T11:14:54Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![tsullivan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/tsullivan/32/31077_2.png) [@tsullivan](https://discuss.elastic.co/u/tsullivan)
#### Post date: [May 25, 2016, 4:26pm UTC](https://discuss.elastic.co/t/get-average-of-response-time-in-specific-interval/50828/6 "2016-05-25T16:26:13Z")

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The mappings are held in Elasticsearch, Kibana uses those mappings to control what it's able to do with the fields.

Check the mapping for your index by running `curl -XGET "http://hostname:port/logstash-*/_mapping`. If the field is not mapped as a float here, something is going wrong with your logstash.conf.

If your using a `mutate` filter to do the conversion, [this reference](https://discuss.elastic.co/t/convert-string-to-float-failed/32232/3) could be of help.

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