I want to expand on this a bit - both copy_to and transform only modify the
_indexed_ document, not the source document. The thinking is that you can
modify the source document yourself in the source application but the
source application _can't_ modify the indexed document without modifying
the source document. Copy_to is useful for playing tricks like
concatenating multiple fields together so you only have to search on one of
them at a time rather than all of them.

For what it looks like you are doing I suggest using nested fields:
http://www.elastic.co/guide/en/elasticsearch/reference/1.3/_multi_fields.html

Nik

On Mon, Apr 13, 2015 at 11:23 AM, David Pilato <[email protected]> wrote:

> Nothing.
>
> Elasticsearch does not modify _source field which contains the document
> you sent.
> It does create in the inverted index a new field. You can use it to query,
> compute or retrieve if you stored it.
>
> --
> *David Pilato* - Developer | Evangelist
> *elastic.co <http://elastic.co>*
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>
>
>
>
>
> Le 13 avr. 2015 à 17:02, Michael Young <[email protected]> a
> écrit :
>
> I'm having issues getting the "copy_to" functionality to work.  It seems
> pretty straight forward, so I wasn't expecting any problems.
>
> Here is my index creation call:
>
> curl -XPUT http://esnode:9200/test_index -d '{
>   "settings" : {
>     "number_of_shards" : 1,
>     "number_of_replicas" : 1,
>     "index.mapping.ignore_malformed" : true
>   },
>   "mappings" : {
>     "default" : {
>       "properties": {
>         "name" : {
>           "type" : "string",
>           "copy_to" : "name_phonetic"
>         },
>         "name_phonetic" : {
>           "type" : "string"
>         }
>       }
>     }
>   }
> }'
>
> curl -XPUT http://esnode:9200/test_index/default/1 -d '{
>   "name" : "smith"
> }'
>
> When I query against test_index/default, I can see that "smith" is in the
> "name" field.  However the "name_phonetic" field is blank.  What am I
> missing?
>
> Thank you!
>
> --
> Michael
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