# How to create a parent using the new join type with logstash
**URL:** https://discuss.elastic.co/t/how-to-create-a-parent-using-the-new-join-type-with-logstash/119523
**Category:** Logstash
**Created:** [February 12, 2018, 5:34pm UTC](https://discuss.elastic.co/t/how-to-create-a-parent-using-the-new-join-type-with-logstash/119523 "2018-02-12T17:34:25Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@mmoxam](https://discuss.elastic.co/u/mmoxam)
#### Post date: [February 12, 2018, 5:34pm UTC](https://discuss.elastic.co/t/how-to-create-a-parent-using-the-new-join-type-with-logstash/119523/1 "2018-02-12T17:34:25Z")
With the introduction of the new join datatype, parent child relationships have been updated to a new format. How can I use Logstash to specify the field that will be used as the join between the parent and the child.
Docuemntation: [https://www.elastic.co/guide/en/elasticsearch/reference/current/parent-join.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/parent-join.html)
I also see that the Elastic Search output plugin has a parent field that will allow me to set the parent for the child but how do I setup the mapping to begin with using Logstash?
---
### Author:  [@mmoxam](https://discuss.elastic.co/u/mmoxam)
#### Post date: [February 21, 2018, 3:29pm UTC](https://discuss.elastic.co/t/how-to-create-a-parent-using-the-new-join-type-with-logstash/119523/2 "2018-02-21T15:29:31Z")
I figured it out:
First setup your mapping to create the join field.:
_(Not sure how to do this straight from logstash. If someone else does please let me know.)_
```
PUT logstash-index-name
{
"mappings": {
"doc": {
"properties": {
"join_field": {
"type": "join",
"relations": {
"customer": "actions"
}
}
}
}
}
}
```
You can add a parent via Logstash with:
```
mutate {
add_field => { "join_field" => "customer" }
}
```
And you can add a child like this:
```
mutate {
add_field => {"[join_field][name]" => "actions"}
add_field => {"[join_field][parent]" => "%{parent_id}"}
}
```
You also need to add the routing id in the Logstash output Elastic Search plugin:
```
if [type] == "child_actions" {
elasticsearch {
hosts => ["localhost:9200"]
index => "logstash-index-name"
routing => "%{parent_id}"
}
}
```
All child documents will now have the "join\_field" as a nested field.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [March 21, 2018, 3:29pm UTC](https://discuss.elastic.co/t/how-to-create-a-parent-using-the-new-join-type-with-logstash/119523/3 "2018-03-21T15:29:45Z")
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