# Use java Api to set a document's field as \_id
**URL:** https://discuss.elastic.co/t/use-java-api-to-set-a-documents-field-as--id/18912
**Category:** Elasticsearch
**Created:** [July 25, 2014, 11:22pm UTC](https://discuss.elastic.co/t/use-java-api-to-set-a-documents-field-as--id/18912 "2014-07-25T23:22:41Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Chia\_Eng\_Chang](https://discuss.elastic.co/u/Chia_Eng_Chang)
#### Post date: [July 25, 2014, 11:22pm UTC](https://discuss.elastic.co/t/use-java-api-to-set-a-documents-field-as--id/18912/1 "2014-07-25T23:22:41Z")
I want to ask if the unique field \_id be assigned by certain field within document. I see with Rest, it can achieve by "path":
```
{
"tweet" : {
"_id" : {
"path" : "post_id"
}
}
}
```
But if I want to do it with java API, is there any way to achieve it?
```
Map MapA= new HashMap();
MapA=MapProcessor(MapA);
client.prepareIndex("index","type").setSource(MapA).execute().actionGet();
```
How could I modify my code to assign certain field in Map to become \_id of
this type?
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---
### Author:  [@Kireet\_Reddy](https://discuss.elastic.co/u/Kireet_Reddy)
#### Post date: [July 27, 2014, 6:09pm UTC](https://discuss.elastic.co/t/use-java-api-to-set-a-documents-field-as--id/18912/2 "2014-07-27T18:09:00Z")
You should check out the IndexRequestBuilder class. It helps simplify
creating indexing requests and has a setId() method.
On Friday, July 25, 2014 4:22:42 PM UTC-7, Chia-Eng Chang wrote:
> I want to ask if the unique field \_id be assigned by certain field within document. I see with Rest, it can achieve by "path":
>
> ```
> {
> "tweet" : {
> "_id" : {
> "path" : "post_id"
> }
> }
> }
>
> ```
>
> But if I want to do it with java API, is there any way to achieve it?
>
> ```
> Map MapA= new HashMap();
> MapA=MapProcessor(MapA);
>
> client.prepareIndex("index","type").setSource(MapA).execute().actionGet();
>
> ```
>
> How could I modify my code to assign certain field in Map to become \_id of
> this type?
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---
### Author:  [@Ivan](https://discuss.elastic.co/u/Ivan)
#### Post date: [July 28, 2014, 4:21pm UTC](https://discuss.elastic.co/t/use-java-api-to-set-a-documents-field-as--id/18912/3 "2014-07-28T16:21:09Z")
The behavior is applied at the creation of the index within the mapping,
not during the prepareIndex call. The example you provided is part of the
mapping and not part of the document that gets indexed. If you want to
override which field will be used as the \_id field, you would need to
change your mapping.
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Cheers,
Ivan
On Sun, Jul 27, 2014 at 11:09 AM, Kireet Reddy [kireet@feedly.com](mailto:kireet@feedly.com) wrote:
> You should check out the IndexRequestBuilder class. It helps simplify
> creating indexing requests and has a setId() method.
>
> On Friday, July 25, 2014 4:22:42 PM UTC-7, Chia-Eng Chang wrote:
>
> > I want to ask if the unique field \_id be assigned by certain field within document. I see with Rest, it can achieve by "path":
> >
> > ```
> > {
> > "tweet" : {
> > "_id" : {
> > "path" : "post_id"
> > }
> > }
> > }
> >
> > ```
> >
> > But if I want to do it with java API, is there any way to achieve it?
> >
> > ```
> > Map MapA= new HashMap();
> > MapA=MapProcessor(MapA);
> >
> > client.prepareIndex("index","type").setSource(MapA).execute().actionGet();
> >
> > ```
> >
> > How could I modify my code to assign certain field in Map to become \_id
> > of this type?
>
> --
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> [https://groups.google.com/d/msgid/elasticsearch/66966b06-71dc-4ff9-a863-4371bf9ca368%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/66966b06-71dc-4ff9-a863-4371bf9ca368%40googlegroups.com?utm_medium=email&utm_source=footer)
> .
>
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---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 1:12am UTC](https://discuss.elastic.co/t/use-java-api-to-set-a-documents-field-as--id/18912/4 "2017-07-06T01:12:45Z")