# When Sort use \_ignoring\_unmapped\_fields how search\_after do?

**URL:** <https://discuss.elastic.co/t/when-sort-use-ignoring-unmapped-fields-how-search-after-do/192828>\
**Category:** Elasticsearch\
**Created:** [July 30, 2019, 6:16am UTC](https://discuss.elastic.co/t/when-sort-use-ignoring-unmapped-fields-how-search-after-do/192828 "2019-07-30T06:16:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![luyuncheng](https://avatars.discourse-cdn.com/v4/letter/l/b3f665/32.png) [@luyuncheng](https://discuss.elastic.co/u/luyuncheng)\
**Post date:** [July 30, 2019, 6:16am UTC](https://discuss.elastic.co/t/when-sort-use-ignoring-unmapped-fields-how-search-after-do/192828/1 "2019-07-30T06:16:36Z")

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In ES version6.3.2  
I am confusing is it a bug or a feature as following descriptions:

1. when use sort [\_ignoring\_unmapped\_fields](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-sort.html#_ignoring_unmapped_fields),  
**why there is ambiguous response in unmapped\_type**  
WHEN USE type:float/double  
`PUT test_index/_search { "sort": { "unknown_field": { "unmapped_type": "float/double" }, "_id": { "order": "asc" } } }`  
RESPNSE in sort  
`"sort": ["Infinity", "xxxID"]`  
WHEN USE type:byte/boolean/integer  
`PUT test_index/_search { "sort": { "unknown_field": { "unmapped_type": "byte/boolean/integer" }, "_id": { "order": "asc" } } }`  
RESPNSE in sort is INT64MAX  
`"sort": [9223372036854775807, "xxxID"]`  
WHEN USE type:string/keyword  
`PUT test_index/_search { "sort": { "unknown_field": { "unmapped_type": "string/keyword" }, "_id": { "order": "asc" } } }`  
RESPNSE in sort is null  
`"sort": [null, "xxxID"]`
2. **when use unmapped\_fields how a search\_after do to ignore these value**?

so i issued: [https://github.com/elastic/elasticsearch/issues/44904](https://github.com/elastic/elasticsearch/issues/44904)

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 27, 2019, 6:16am UTC](https://discuss.elastic.co/t/when-sort-use-ignoring-unmapped-fields-how-search-after-do/192828/2 "2019-08-27T06:16:38Z")

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