ElasticSearch: search document pairs by specific query?

How to search for the document pairs that matched to specific queryhttp://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl.html (in
my case it is more_like_this queryhttp://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-mlt-query.html#query-dsl-mlt-query)
and order them using a specific field(s)?

Probably pairs can be formed using aggregationshttp://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations.html but
I can't figure out how.

Also have no idea if we even form such aggregated pairs then how to order
them?
Question is posted to stackoverflow, will appreciate if you answer there:
http://stackoverflow.com/questions/23938975/elasticsearch-search-document-pairs-by-specific-query

Thanks.

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