On Mon, Feb 17, 2014 at 4:23 PM, Vallabh Bothre <[email protected]>wrote:

> As per your suggestion i used search type which execute the query on all
> relevant shards and return the results.
> "search_type" => "query_then_fetch"
>

As per


> http://www.elasticsearch.org/guide/en/elasticsearch/
>> reference/current/search-request-search-type.html
>>
>
this is the default search type used even when not explicitly specifying a
search type.

 As per

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/index-
>> modules-similarity.html
>>
>
Elasticsearch uses TF/IDF as default similarity. For more information on
how TF/IDF is computed see also the Lucene documentation:

http://lucene.apache.org/core/4_0_0/core/org/apache/lucene/search/similarities/TFIDFSimilarity.html

The different scores you are seeing is probably caused by different IDF
scores on each shard. If you really need the exact IDF values on each shard
you should checkout dfs_query_[and/then]_fetch.


Isabel

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