# Mapping of new fields
**URL:** https://discuss.elastic.co/t/mapping-of-new-fields/6140
**Category:** Elasticsearch
**Created:** [December 13, 2011, 2:46pm UTC](https://discuss.elastic.co/t/mapping-of-new-fields/6140 "2011-12-13T14:46:26Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Andrej](https://discuss.elastic.co/u/Andrej)
#### Post date: [December 13, 2011, 2:46pm UTC](https://discuss.elastic.co/t/mapping-of-new-fields/6140/1 "2011-12-13T14:46:26Z")
Hi,
I have a question about mapping for new fields. I already have
documents of a type (lets say test\_doc) in an index. Now I want to add
a new field ("new") to this document. So far no problem. But what if I
decide to not store this field in the source? Can I write a new
mapping like
```
"test_doc" : {
"_source" : {
"excludes" : ["new"]
}
}
```
and add it to the index? Trying something similar with a new property
works, but what about source? Is there a way to achieve my goal at
all?
Thanks,
Andrej
---
### Author:  [@Lukas\_Vlcek1](https://discuss.elastic.co/u/Lukas_Vlcek1)
#### Post date: [December 13, 2011, 8:50pm UTC](https://discuss.elastic.co/t/mapping-of-new-fields/6140/2 "2011-12-13T20:50:43Z")
Hi,
I think this can help you [Elasticsearch Platform — Find real-time answers at scale | Elastic](http://www.elasticsearch.org/guide/reference/mapping/source-field.html)
(Check Includes/Excludes section)
--
Regards,
Lukas
On Tuesday, December 13, 2011 at 3:46 PM, Andrej Rosenheinrich wrote:
> Hi,
>
> I have a question about mapping for new fields. I already have
> documents of a type (lets say test\_doc) in an index. Now I want to add
> a new field ("new") to this document. So far no problem. But what if I
> decide to not store this field in the source? Can I write a new
> mapping like
>
> "test\_doc" : {
> "\_source" : {
> "excludes" : ["new"]
> }
> }
>
> and add it to the index? Trying something similar with a new property
> works, but what about source? Is there a way to achieve my goal at
> all?
>
> Thanks,
> Andrej
---
### Author:  [@kimchy](https://discuss.elastic.co/u/kimchy)
#### Post date: [December 13, 2011, 10:16pm UTC](https://discuss.elastic.co/t/mapping-of-new-fields/6140/3 "2011-12-13T22:16:13Z")
The only two mappings that can be changed (merged) into the \_source are
compress and compress\_threshold. We can add exclude and include to allow
them to be updated dynamically, open an issue (and possibly implement it,
the code should be simple:
[https://github.com/elasticsearch/elasticsearch/blob/master/src/main/java/org/elasticsearch/index/mapper/internal/SourceFieldMapper.java#L342](https://github.com/elasticsearch/elasticsearch/blob/master/src/main/java/org/elasticsearch/index/mapper/internal/SourceFieldMapper.java#L342)
.
On Tue, Dec 13, 2011 at 4:46 PM, Andrej Rosenheinrich \<
[andrej.rosenheinrich@unister.de](mailto:andrej.rosenheinrich@unister.de)\> wrote:
> Hi,
>
> I have a question about mapping for new fields. I already have
> documents of a type (lets say test\_doc) in an index. Now I want to add
> a new field ("new") to this document. So far no problem. But what if I
> decide to not store this field in the source? Can I write a new
> mapping like
>
> "test\_doc" : {
> "\_source" : {
> "excludes" : ["new"]
> }
> }
>
> and add it to the index? Trying something similar with a new property
> works, but what about source? Is there a way to achieve my goal at
> all?
>
> Thanks,
> Andrej
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 3:45am UTC](https://discuss.elastic.co/t/mapping-of-new-fields/6140/4 "2017-07-06T03:45:30Z")