# Join and search in 2 index

**URL:** <https://discuss.elastic.co/t/join-and-search-in-2-index/58459>\
**Category:** Elasticsearch\
**Created:** [August 19, 2016, 1:09pm UTC](https://discuss.elastic.co/t/join-and-search-in-2-index/58459 "2016-08-19T13:09:21Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![mujibkhan](https://avatars.discourse-cdn.com/v4/letter/m/3e96dc/32.png) [@mujibkhan](https://discuss.elastic.co/u/mujibkhan)\
**Post date:** [August 19, 2016, 1:09pm UTC](https://discuss.elastic.co/t/join-and-search-in-2-index/58459/1 "2016-08-19T13:09:21Z")

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i have created 2 index. I like have a elastic linq query. As of now with single index I am able to write a query. How to join another index with existing index any work around. Please let me know.

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**Author:** ![Josh\_Harrison](https://avatars.discourse-cdn.com/v4/letter/j/0ea827/32.png) [@Josh\_Harrison](https://discuss.elastic.co/u/Josh_Harrison)\
**Post date:** [August 20, 2016, 3:42am UTC](https://discuss.elastic.co/t/join-and-search-in-2-index/58459/2 "2016-08-20T03:42:32Z")

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Are you looking to query multiple indexes with one command? You can specify multiple indexes in your search string, like:  
`curl -XPOST http://localhost:9200/index1,index2/_search -d'{}'`  
You can also create a common alias on both indexes - see [https://www.elastic.co/guide/en/elasticsearch/reference/2.3/indices-aliases.html](https://www.elastic.co/guide/en/elasticsearch/reference/2.3/indices-aliases.html)  
If you created an alias "mydata" on index1 and index2, then searching  
`curl -XPOST http://localhost:9200/mydata/_search -d'{}'`  
automatically searches across both index1 and index2

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**Author:** ![mujibkhan](https://avatars.discourse-cdn.com/v4/letter/m/3e96dc/32.png) [@mujibkhan](https://discuss.elastic.co/u/mujibkhan)\
**Post date:** [August 22, 2016, 4:15am UTC](https://discuss.elastic.co/t/join-and-search-in-2-index/58459/3 "2016-08-22T04:15:32Z")

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Hi Josh,  
I am sorry for the delay. I have created 2 index. Namely employee and department. By linq query I need to filter employee index department wise.  
In .net linq for example

var emp=from n in employee join department d on [d.id](http://d.id) equals n.departmentid where d.id==1 select n;

By which I am to filter employee by department wise.  
I dont know to do search index.

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**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\
**Post date:** [August 22, 2016, 7:02am UTC](https://discuss.elastic.co/t/join-and-search-in-2-index/58459/4 "2016-08-22T07:02:38Z")

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You can't do that. Although you could look at parent/child feature.

Or change your design.

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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 5, 2017, 10:26pm UTC](https://discuss.elastic.co/t/join-and-search-in-2-index/58459/5 "2017-07-05T22:26:16Z")

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