[Solr Wiki] Update of "MoreLikeThisHandler" by HossMan

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http://wiki.apache.org/solr/MoreLikeThisHandler

New page:
The [http://lucene.apache.org/solr/api/org/apache/solr/handler/MoreLikeThisHandler.html MoreLikeThisHandler] is designed to generate information about "similar" documents using the MoreLikeThis functionality provided by Lucene.  It supports faceting, paging, and filtering using CommonQueryParameters.

<!> ["Solr1.3"]

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== Params ==

|| '''param'''       || '''description''' ||
|| mlt.match.include || Should the response include the matched document?  If false, the response will look exactly like a normal /select response ||
|| mlt.match.offset  || By default, the MoreLikeThis query operates on the first result for 'q' ||
|| mlt.interestingTerms || One of: "list", "details", "none" -- this will show what "interesting" terms are used for the MoreLikeThis query.  These are the top tf/idf terms.  NOTE: if you select 'details', this shows you the term and boost used for each term.  Unless `mlt.boost=true` all terms will have boost=1.0 ||

The MoreLikeThisHandler can also use a ContentStream to find similar documents.  It will extract the "interesting terms" from the posted text.


== Examples ==

=== Simple ===

http://localhost:8983/solr/mlt?q=id:UTF8TEST&mlt.fl=manu,cat&mlt.mindf=1&mlt.mintf=1

http://localhost:8983/solr/mlt?q=id:UTF8TEST&mlt.fl=manu,cat&mlt.mindf=1&mlt.mintf=1&mlt.match.include=false

http://localhost:8983/solr/mlt?q=id:SP2514N&mlt.fl=manu,cat&mlt.mindf=1&mlt.mintf=1&fq=inStock:true&mlt.displayTerms=details


=== Using ContentStreams ===

If you post text in the body, that will be used for similarity.  Alternatively, you can put the posted content in the URL using something like:

http://localhost:8983/solr/mlt?stream.body=electronics%20memory&mlt.displayTerms=list&mlt.mintf=0

If `remoteStreaming` is enabled, you can find documents similar to the text on a webpage:

http://localhost:8983/solr/mlt?stream.url=http://lucene.apache.org/solr/&mlt.displayTerms=list&mlt.mintf=0
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CategorySolrRequestHandler