# What happens to properties that are not explicitly named in the mapping? **URL:** \ **Category:** Elasticsearch\ **Created:** [July 20, 2011, 9:10am UTC](https://discuss.elastic.co/t/what-happens-to-properties-that-are-not-explicitly-named-in-the-mapping/4904 "2011-07-20T09:10:19Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Pawel\_Krakowiak](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/pawel_krakowiak/32/2615_2.png) [@Pawel\_Krakowiak](https://discuss.elastic.co/u/Pawel_Krakowiak)\ **Post date:** [July 20, 2011, 9:10am UTC](https://discuss.elastic.co/t/what-happens-to-properties-that-are-not-explicitly-named-in-the-mapping/4904/1 "2011-07-20T09:10:19Z")
Say I have a simple mapping that defines only a few properties. Then I index documents that have a few times more properties, including the ones specified in the mapping. What happens to those extra properties that were not defined in the mapping? Are they simply omitted (i.e., ignored - not indexed, not analyzed, not stored)? ---
**Author:** ![Clinton\_Gormley](https://avatars.discourse-cdn.com/v4/letter/c/50afbb/32.png) [@Clinton\_Gormley](https://discuss.elastic.co/u/Clinton_Gormley)\ **Post date:** [July 20, 2011, 9:14am UTC](https://discuss.elastic.co/t/what-happens-to-properties-that-are-not-explicitly-named-in-the-mapping/4904/2 "2011-07-20T09:14:36Z")
On Wed, 2011-07-20 at 02:10 -0700, Pawel Krakowiak wrote: > Say I have a simple mapping that defines only a few properties. Then I > index documents that have a few times more properties, including the > ones specified in the mapping. What happens to those extra properties > that were not defined in the mapping? Are they simply omitted (i.e., > ignored - not indexed, not analyzed, not stored)? They are dynamically added to the mapping based on the type of data they appear to be, eg strings are added as analyzed, numbers as not\_analyzed. No field is set to 'stored' by default, as it is usually more efficient to just get the data out of \_source (ie the JSON document that you index) clint ---
**Author:** ![Pawel\_Krakowiak](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/pawel_krakowiak/32/2615_2.png) [@Pawel\_Krakowiak](https://discuss.elastic.co/u/Pawel_Krakowiak)\ **Post date:** [July 20, 2011, 10:24am UTC](https://discuss.elastic.co/t/what-happens-to-properties-that-are-not-explicitly-named-in-the-mapping/4904/3 "2011-07-20T10:24:56Z")
On 20 Lip, 11:14, Clinton Gormley [clin...@iannounce.co.uk](mailto:clin...@iannounce.co.uk) wrote: > They are dynamically added to the mapping based on the type of data they > appear to be, eg strings are added as analyzed, numbers as not\_analyzed. So if I don't want to store something, I need to tell ES explicitly to skip it? Please note that I am talking of a scenario where I already have a mapping in place (hence not the situation where there's no mapping and I'm adding a document for the first time). ---
**Author:** ![Clinton\_Gormley](https://avatars.discourse-cdn.com/v4/letter/c/50afbb/32.png) [@Clinton\_Gormley](https://discuss.elastic.co/u/Clinton_Gormley)\ **Post date:** [July 20, 2011, 10:32am UTC](https://discuss.elastic.co/t/what-happens-to-properties-that-are-not-explicitly-named-in-the-mapping/4904/4 "2011-07-20T10:32:12Z")
Hiya > On 20 Lip, 11:14, Clinton Gormley [clin...@iannounce.co.uk](mailto:clin...@iannounce.co.uk) wrote: > > > They are dynamically added to the mapping based on the type of data they > > appear to be, eg strings are added as analyzed, numbers as not\_analyzed. > > So if I don't want to store something, I need to tell ES explicitly to > skip it? Please note that I am talking of a scenario where I already > have a mapping in place (hence not the situation where there's no > mapping and I'm adding a document for the first time). Note: there is a difference between 'store' and 'index'. No field is stored by default (except for the \_source). However, all fields will be indexed by default, unless you specify otherwise clint ---
**Author:** ![Pawel\_Krakowiak](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/pawel_krakowiak/32/2615_2.png) [@Pawel\_Krakowiak](https://discuss.elastic.co/u/Pawel_Krakowiak)\ **Post date:** [July 20, 2011, 3:14pm UTC](https://discuss.elastic.co/t/what-happens-to-properties-that-are-not-explicitly-named-in-the-mapping/4904/5 "2011-07-20T15:14:14Z")
On 20 Lip, 12:32, Clinton Gormley [clin...@iannounce.co.uk](mailto:clin...@iannounce.co.uk) wrote: > Note: there is a difference between 'store' and 'index'. No field is > stored by default (except for the \_source). Noted. Sorry for incorrect wording. > However, all fields will be indexed by default, unless you specify > otherwise I see. Thank you for the clarification. ---
**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, 4:00am UTC](https://discuss.elastic.co/t/what-happens-to-properties-that-are-not-explicitly-named-in-the-mapping/4904/6 "2017-07-06T04:00:02Z")