Hi Nishant, Thank you for the reply.
I believe that solr removes the first document from the mlt list because a document is most similar to "itself" and thus should be removed. In my case, "aaa" and "bbb" are two different documents. When search for documents similar to "aaa", the document "aaa" should be removed from the list, but "bbb" should be kept. I did the experiment you suggested. Unfortunately, the document "ccc" was not in the mlt list. I modify the title of "ccc" to a somewhat different sentence "a black fox jumps over a yellow flower", but the document "ccc" was not in the list either. :-( Anyone has any clues on this? Thanks! -- View this message in context: http://lucene.472066.n3.nabble.com/Solr-mlt-doesn-t-return-documents-with-exactly-the-same-contents-tp4171284p4171382.html Sent from the Solr - User mailing list archive at Nabble.com.