SearchType in ElasticSearch search Query

Hi Guys,

it's my first post here on this group so feel free to make me aware of the
guidelines if any.

My query is regarding the SearchType QueryAndFetch
http://www.elastic.co/guide/en/elasticsearch/reference/1.5/search-request-search-type.html#query-and-fetch.
As far as I understand this is not recommended for end-user use as
mentioned in the
document referred. However, this turns out to be the most performant
setting for us ( All our shards are on the same node) and this is returning
correct results as well. So both from performance and correctness stand
point I find it to be the most compelling choice.

I want to understand why exactly is it not recommended then.

Thanks!
Avinash

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