If you are referring to 
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/mapping-id-field.html#mapping-id-field

It describes what I wrote.

The _id mapping can also be associated with a path that will be used to extract 
the id from a different location in the source document. For example, having 
the following mapping:

{
    "tweet" : {
        "_id" : {
            "path" : "post_id"
        }
    }
}
Will cause 1 to be used as the id for:

{
    "message" : "You know, for Search",
    "post_id" : "1"
}

^^^^ This means that if you send the above document, elasticsearch will extract 
the _id from the _source.post_id field.

Elasticsearch never modifies your _source document (unless you use scripts or 
include/exclude features).




-- 
David Pilato | Technical Advocate | Elasticsearch.com
@dadoonet | @elasticsearchfr


Le 18 juillet 2014 à 15:21:24, Giuseppe Longo ([email protected]) a écrit:

I'm not sure to understand you.
I've followed step by step the tutorial, it's strange that  setting path to 
`_id` do the opposite currently, or not?
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