Dot field name when replacing "fields" parameter with "_source"

Elastic Stack Elasticsearch
1

Hello,

      1.x Elasticsearch now supports source filtering with "_source"

parameter. Basically this will replace the behaviour of "fields" parameter
in pre-1.x version (especially when fields data are not stored). Migrating
to "_source" is straightforward, however, I noticed one difference when
returning a nested field:

  • with "fields" in all versions of ES, a query
    {
    "query": {
    "match_all": {}
    },
    "fields": "person.name"
    }

will return hits as:
{...
"fields": {
"person.name": "Tom"
}
}

  • with "_source" in 1.x ES, a query
    {
    "query": {
    "match_all": {}
    },
    "_source": "person.name"
    }

will return hits as:
{...
"_source": {
"person": {
"name": "Tom"
}
}
}

I actually prefer the 2nd format, however, because we are migrating a web
API to our end users, who might still expect the 1st format, I'd like to
maintain the compatibility by giving users option to return nested fields
using dot notation. I can probably do that transformation after ES queries,
but I'm wondering if there is still a way to toggle the return format in ES
directly.

Thanks,

Chunlei
(BTW, I really enjoyed the first ElasticON, you guys did a wonderful job!)

Ref:
http://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-source-filtering.html

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