# "boost" in mapping - deprecated?

**URL:** <https://discuss.elastic.co/t/boost-in-mapping-deprecated/126731>\
**Category:** Elasticsearch\
**Created:** [April 4, 2018, 11:11am UTC](https://discuss.elastic.co/t/boost-in-mapping-deprecated/126731 "2018-04-04T11:11:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![galund](https://avatars.discourse-cdn.com/v4/letter/g/ecb155/32.png) [@galund](https://discuss.elastic.co/u/galund)\
**Post date:** [April 4, 2018, 11:11am UTC](https://discuss.elastic.co/t/boost-in-mapping-deprecated/126731/1 "2018-04-04T11:11:55Z")

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I'm looking at the documentation for "boost" as a _mapping_ parameter: [https://www.elastic.co/guide/en/elasticsearch/reference/master/mapping-boost.html](https://www.elastic.co/guide/en/elasticsearch/reference/master/mapping-boost.html)

I'm confused by the bit that says:

> Deprecated in 5.0.0.  
> index time boost is deprecated. Instead, the field mapping boost is applied at query time. For indices created before 5.0.0 the boost will still be applied at index time.

I'm quite happy with this being applied at query time, but the documentation seems (perhaps?) to be suggesting that including "boost" in the mapping _at all_ is being deprecated?

If it's just that the behaviour has changed (i.e. when specified in a mapping, the boost will now be applied at query time, but never at index time), then the word 'deprecated' seems to be the wrong word to use. Some clarity on this point in the docs would anyway be useful?

thanks  
George

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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:** [May 2, 2018, 11:11am UTC](https://discuss.elastic.co/t/boost-in-mapping-deprecated/126731/2 "2018-05-02T11:11:57Z")

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