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> > .
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### Author:  [@Dennis](https://discuss.elastic.co/u/Dennis)
#### Post date: [March 4, 2015, 5:13am UTC](https://discuss.elastic.co/t/safe-to-set-doc-values-true-on-existing-index/22502/4 "2015-03-04T05:13:50Z")
I read the manual, and I still don't quite get what doc\_values is. Anyone
can explain it better than the manual?
On Tuesday, March 3, 2015 at 3:17:13 PM UTC-8, Justin Zhu wrote:
> Would this start building the doc values structure for new documents
> indexed and not prior docs?
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [March 4, 2015, 6:16am UTC](https://discuss.elastic.co/t/safe-to-set-doc-values-true-on-existing-index/22502/5 "2015-03-04T06:16:05Z")
It replaces field data and instead of storing things in heap, it stores
them on disk. You take a minor performance hit but you get a lot more back
by freeing up your heap.
On 4 March 2015 at 16:13, Dennis [gearond@gmail.com](mailto:gearond@gmail.com) wrote:
> I read the manual, and I still don't quite get what doc\_values is. Anyone
> can explain it better than the manual?
>
> On Tuesday, March 3, 2015 at 3:17:13 PM UTC-8, Justin Zhu wrote:
>
> > Would this start building the doc values structure for new documents
> > indexed and not prior docs?
>
> --
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### Author:  [@jpountz](https://discuss.elastic.co/u/jpountz)
#### Post date: [March 4, 2015, 10:04am UTC](https://discuss.elastic.co/t/safe-to-set-doc-values-true-on-existing-index/22502/6 "2015-03-04T10:04:05Z")
Unfortunately, doc values cannot be added on an existing index. However it
would work if you have eg. daily indices and change your index template so
that new indices have doc values enabled.
On the other hand, if you want to add doc values to an existing index, you
would need to reindex.
On Wed, Mar 4, 2015 at 12:17 AM, Justin Zhu [haoranjzhu@gmail.com](mailto:haoranjzhu@gmail.com) wrote:
> Would this start building the doc values structure for new documents
> indexed and not prior docs?
>
> --
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> [https://groups.google.com/d/msgid/elasticsearch/189c9ede-cd7f-408e-8bf2-08a858d452be%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/189c9ede-cd7f-408e-8bf2-08a858d452be%40googlegroups.com?utm_medium=email&utm_source=footer)
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [March 4, 2015, 10:43am UTC](https://discuss.elastic.co/t/safe-to-set-doc-values-true-on-existing-index/22502/7 "2015-03-04T10:43:00Z")
After chatting with Adrien about this and how the code works, I'll defer to
his greater knowledge.
On 04/03/2015 9:04 pm, "Adrien Grand" [adrien.grand@elasticsearch.com](mailto:adrien.grand@elasticsearch.com)
wrote:
> Unfortunately, doc values cannot be added on an existing index. However it
> would work if you have eg. daily indices and change your index template so
> that new indices have doc values enabled.
>
> On the other hand, if you want to add doc values to an existing index, you
> would need to reindex.
>
> On Wed, Mar 4, 2015 at 12:17 AM, Justin Zhu [haoranjzhu@gmail.com](mailto:haoranjzhu@gmail.com) wrote:
>
> > Would this start building the doc values structure for new documents
> > indexed and not prior docs?
> >
> > --
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> > .
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>
> --
> Adrien Grand
>
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### Author:  [@Justin\_Zhu\_2](https://discuss.elastic.co/u/Justin_Zhu_2)
#### Post date: [March 6, 2015, 2:09am UTC](https://discuss.elastic.co/t/safe-to-set-doc-values-true-on-existing-index/22502/8 "2015-03-06T02:09:25Z")
Thanks for the info Adrien & Mark. Looks like we'll just reindex.
On Wednesday, March 4, 2015 at 2:43:15 AM UTC-8, Mark Walkom wrote:
> After chatting with Adrien about this and how the code works, I'll defer
> to his greater knowledge.
> On 04/03/2015 9:04 pm, "Adrien Grand" \<[adrien...@elasticsearch.com](mailto:adrien...@elasticsearch.com)
> \\> wrote:
>
> > Unfortunately, doc values cannot be added on an existing index. However
> > it would work if you have eg. daily indices and change your index template
> > so that new indices have doc values enabled.
> >
> > On the other hand, if you want to add doc values to an existing index,
> > you would need to reindex.
> >
> > On Wed, Mar 4, 2015 at 12:17 AM, Justin Zhu \<[haora...@gmail.com](mailto:haora...@gmail.com)
> > \\> wrote:
> >
> > > Would this start building the doc values structure for new documents
> > > indexed and not prior docs?
> > >
> > > --
> > > You received this message because you are subscribed to the Google
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> > > .
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> >
> > --
> > Adrien Grand
> >
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 12:28am UTC](https://discuss.elastic.co/t/safe-to-set-doc-values-true-on-existing-index/22502/9 "2017-07-06T00:28:12Z")