How does Solr's MoreLikeThis component internally work to get results?

Question

I'm new to Apache Solr and am currently exploring/trying to make use of MoreLikeThis as a search component (instead of dedicated request handler). I'm finding difficult to understand clearly on how this works internally to get more-like-this results?

For example, I'm trying to search for the word java in one of the document field named mytextcontentfield:

http://localhost/solr/core0/select/?q=mytextcontentfield:java&version=2.2&start=0&rows=10&indent=on&debugQuery=on&mlt=true&mlt.fl=mytextcontentfield

and I could see moreLikeThis in the XML response with unique keys of the documents in name attribute.

My questions here is, how does Solr internally work/match to find more-like-this documents based on the search keyword java? Any explanation with good example are appreciated.

Answer 1

Looks there's no Solr documentation that explain this feature in detail.

But somehow, after some google, managed to find a write-up on How MoreLikeThis Works in Lucene.