# Joining

**URL:** <https://discuss.elastic.co/t/joining/136228>\
**Category:** Elasticsearch\
**Created:** [June 18, 2018, 1:34am UTC](https://discuss.elastic.co/t/joining/136228 "2018-06-18T01:34:57Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![mkaczor](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mkaczor/32/32352_2.png) [@mkaczor](https://discuss.elastic.co/u/mkaczor)\
**Post date:** [June 18, 2018, 1:34am UTC](https://discuss.elastic.co/t/joining/136228/1 "2018-06-18T01:34:57Z")

</div>

Hello,

I am learning to use Elasticsearch. I have a little question. I created two index, one with "dateofbirth" and "names" of peoples and the second index is with "order" and names so i used system of parent/child but I am not sure if what I did is good because when I try it's not really the result what I that I thought.  
My code looks like this.

```
POST person/delivery
{
  "yearOfBirth":[1995, 2001], 
   "mappings": {
     "_doc": {
       "properties": {
          "my_join_field": { 
            "names": ["John", "Phil"] 
         }
       }
     }
  }
}

POST /business/delivery
{
  "order": "Hello how are you",
  "my_join_field": {
     "name" : "names",
     "parent": "zXSREGQBvDb6z7K3nBMu"
  }
}

```

I thank you in advance for your help

---

<div class="post-metadata">

**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:** [June 18, 2018, 6:40am UTC](https://discuss.elastic.co/t/joining/136228/2 "2018-06-18T06:40:58Z")

</div>

> [@mkaczor](#):
>
> I am learning to use Elasticsearch.

Great!

> [@mkaczor](#):
>
> i used system of parent/child

I'd not start learning Elasticsearch by doing relations. The best thing to do with a search engine is to denormalize your data. Like indexing something like this instead:

```auto
POST /business/delivery
{
  "order": "Hello how are you",
  "person": {
     "name" : "John"
  }
}

```

---

<div class="post-metadata">

**Author:** ![mkaczor](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mkaczor/32/32352_2.png) [@mkaczor](https://discuss.elastic.co/u/mkaczor)\
**Post date:** [June 18, 2018, 2:38pm UTC](https://discuss.elastic.co/t/joining/136228/3 "2018-06-18T14:38:25Z")

</div>

thank you so much

---

<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:** [July 16, 2018, 2:38pm UTC](https://discuss.elastic.co/t/joining/136228/4 "2018-07-16T14:38:36Z")

</div>

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