# Boost Field - need to defined in mapping definition?

**URL:** <https://discuss.elastic.co/t/boost-field-need-to-defined-in-mapping-definition/4397>\
**Category:** Elasticsearch\
**Created:** [May 13, 2011, 7:36am UTC](https://discuss.elastic.co/t/boost-field-need-to-defined-in-mapping-definition/4397 "2011-05-13T07:36:58Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![maho](https://avatars.discourse-cdn.com/v4/letter/m/4da419/32.png) [@maho](https://discuss.elastic.co/u/maho)\
**Post date:** [May 13, 2011, 7:36am UTC](https://discuss.elastic.co/t/boost-field-need-to-defined-in-mapping-definition/4397/1 "2011-05-13T07:36:58Z")

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Hi,

do I need to define the name of the boost field in my mapping  
definition?  
Or is it possible only to send a json with the field "\_boost"?

Thanks

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**Author:** ![kimchy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kimchy/32/44952_2.png) [@kimchy](https://discuss.elastic.co/u/kimchy)\
**Post date:** [May 13, 2011, 9:28am UTC](https://discuss.elastic.co/t/boost-field-need-to-defined-in-mapping-definition/4397/2 "2011-05-13T09:28:21Z")

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You can just send the json with \_boost. No need to explicit mapping.  
On Friday, May 13, 2011 at 10:36 AM, maho wrote:

> Hi,
> 
> do I need to define the name of the boost field in my mapping  
> definition?  
> Or is it possible only to send a json with the field "\_boost"?
> 
> Thanks

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<div class="post-metadata">

**Author:** ![maho](https://avatars.discourse-cdn.com/v4/letter/m/4da419/32.png) [@maho](https://discuss.elastic.co/u/maho)\
**Post date:** [May 13, 2011, 11:28am UTC](https://discuss.elastic.co/t/boost-field-need-to-defined-in-mapping-definition/4397/3 "2011-05-13T11:28:05Z")

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nice, thanks shay

On 13 Mai, 11:28, Shay Banon [shay.ba...@elasticsearch.com](mailto:shay.ba...@elasticsearch.com) wrote:

> You can just send the json with \_boost. No need to explicit mapping.
> 
> On Friday, May 13, 2011 at 10:36 AM, maho wrote:
> 
> > Hi,
> 
> > do I need to define the name of the boost field in my mapping  
> > definition?  
> > Or is it possible only to send a json with the field "\_boost"?
> 
> > Thanks

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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, 4:06am UTC](https://discuss.elastic.co/t/boost-field-need-to-defined-in-mapping-definition/4397/4 "2017-07-06T04:06:18Z")

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