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More like this

MoreLikeThisQuery finds documents similar to a source document by extracting representative terms from its term vectors and turning them into a weighted boolean query.

Use

using Rowles.LeanLucene.Search.Queries;

var mlt = new MoreLikeThisQuery(
    docId: 42,
    fields: new[] { "title", "body" },
    parameters: new MoreLikeThisParameters
    {
        MinTermFreq    = 2,
        MinDocFreq     = 5,
        MaxQueryTerms  = 25,
        MinWordLength  = 3,
        BoostByScore   = true
    });

var hits = searcher.Search(mlt, topN: 10);

Parameter defaults

Parameter Default
MinTermFreq 1
MinDocFreq 1
MaxDocFreq int.MaxValue
MaxQueryTerms 25
MinWordLength 3
BoostByScore true

Raising MinDocFreq filters out terms that appear in only a handful of documents and would otherwise dominate similarity. Lowering MaxDocFreq filters ultra-common terms.

See also

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