I know this can be done, because I did it in Ultraseek. It was the first 
feature I wrote, probably around 1997.

Take the most significant terms from the document and turn them into a query. 
You can use the tf-idf scores of the terms as weights. I tested my queries 
(without weights) from Ultraseek against several WWW search engines (we used to 
have a lot more of those). Two test documents that I remember were the "Yes, 
Virginia there is a Santa Claus" newspaper column and a Kodak Tri-X film 
datasheet. For there first, there are lots of copies on the internet. For the 
second, there are (were) lots of similar 400 speed black and white films. I was 
an Ilford man, myself.

It worked pretty well.

wunder

On May 14, 2013, at 5:20 PM, Jack Krupansky wrote:

> Do you mean pointing to a document in one collection and retrieving documents 
> from another collection that are similar to the first document? Not that I 
> know of.
> 
> Sounds like a reasonable Jira request.
> 
> But... the too collections would need to be fairly similar overall 
> themselves, because the characterization of the first document would be based 
> on terms in that collection, but those terms might not even occur in the 
> other collection.
> 
> -- Jack Krupansky
> 
> -----Original Message----- From: SweetEmerald
> Sent: Tuesday, May 14, 2013 6:57 PM
> To: solr-user@lucene.apache.org
> Subject: Search MoreLikeThis ID into another collations
> 
> Hi!
> Im new in Solr, I would like to do a MoreLikeThis search for an ID into
> other collections, not only in the collection that owns that ID
> 
> Is that posible? do you have an example?
> 
> Thank you very much!
> 
> 
> 
> --
> View this message in context: 
> http://lucene.472066.n3.nabble.com/Search-MoreLikeThis-ID-into-another-collations-tp4063352.html
> Sent from the Solr - User mailing list archive at Nabble.com. 

--
Walter Underwood
wun...@wunderwood.org



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