# Cannot search doc with key field start with "\_"

**URL:** <https://discuss.elastic.co/t/cannot-search-doc-with-key-field-start-with/218268>\
**Category:** Elasticsearch\
**Created:** [February 7, 2020, 3:00am UTC](https://discuss.elastic.co/t/cannot-search-doc-with-key-field-start-with/218268 "2020-02-07T03:00:38Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Hoang\_Nguyen2](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/hoang_nguyen2/32/62243_2.png) [@Hoang\_Nguyen2](https://discuss.elastic.co/u/Hoang_Nguyen2)\
**Post date:** [February 7, 2020, 3:00am UTC](https://discuss.elastic.co/t/cannot-search-doc-with-key-field-start-with/218268/1 "2020-02-07T03:00:38Z")

</div>

cannot search doc with key field start with "\_"  
I have below doc, when I search doc by url: [http://localhost:9200/indexName/\_search?q=hanoi](http://localhost:9200/indexName/_search?q=hanoi)  
It return empty doc  
{  
"company": "software",  
"\_quantity":500,  
"company\_location":"vietnam",  
"\_city":"hanoi"  
}

Could anyone explain why it happens? and send me link about rule of field name in elasticsearch  
Note: I still can search doc by field name start other character

---

<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:** [March 6, 2020, 3:00am UTC](https://discuss.elastic.co/t/cannot-search-doc-with-key-field-start-with/218268/2 "2020-03-06T03:00:43Z")

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Closed on March 6, 2020, 3:00am UTC

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