# How to define specific mapping in logstash to parse data in certain format

**URL:** <https://discuss.elastic.co/t/how-to-define-specific-mapping-in-logstash-to-parse-data-in-certain-format/41736>\
**Category:** Logstash\
**Created:** [February 15, 2016, 5:25am UTC](https://discuss.elastic.co/t/how-to-define-specific-mapping-in-logstash-to-parse-data-in-certain-format/41736 "2016-02-15T05:25:39Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Lovika\_Jain](https://avatars.discourse-cdn.com/v4/letter/l/958977/32.png) [@Lovika\_Jain](https://discuss.elastic.co/u/Lovika_Jain)\
**Post date:** [February 15, 2016, 5:25am UTC](https://discuss.elastic.co/t/how-to-define-specific-mapping-in-logstash-to-parse-data-in-certain-format/41736/1 "2016-02-15T05:25:39Z")

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Hi,  
I need to parse my data like root:[group:[instance:[hourly:{},monthly:{},daily:{}]]]  
how to define mappings to get data like this?

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**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [February 15, 2016, 6:36am UTC](https://discuss.elastic.co/t/how-to-define-specific-mapping-in-logstash-to-parse-data-in-certain-format/41736/2 "2016-02-15T06:36:24Z")

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You'd typically use a [grok filter](https://www.elastic.co/guide/en/logstash/current/plugins-filters-grok.html) to parse strings like that.

When you say mappings, are you talking about mappings in the Elasticsearch sense?

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**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, 5:11am UTC](https://discuss.elastic.co/t/how-to-define-specific-mapping-in-logstash-to-parse-data-in-certain-format/41736/3 "2017-07-06T05:11:33Z")

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