This is what I found from the documentation

"When we search for documents of a particular type, Elasticsearch simply 
uses a filter on the _type field to restrict results to documents of that 
type."

So it seems the answer is yes.

On Friday, November 21, 2014 8:36:28 PM UTC+5:30, Ajay Divakaran wrote:
>
> Hi all,
>
> If I have an elasticsearch index with a single shard and 0 replicas. Will 
> specifying a document-type part of the match_all query help in performance 
> (i.e narrowing down the result-set)?
>
> i.e 'http://localhost:9200/my-index/my-doc-type/_search vs '
> http://localhost:9200/my-index/_search
>

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