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Editorial Team
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Asked: 2026-06-06T00:12:47+00:00

I’ve been a long time browser here, but never have had a question that

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I’ve been a long time browser here, but never have had a question that wasn’t already asked. So here goes:

I’ve run into a problem using SOLR search where some searches on SOLR (let’s say DVD Players) tend to return a lot of search results from the same manufacturer in the first 50 results.

Now assuming that I want to provide my end-user with the best experience searching, but also the best variety of products in my catalog, how would I go about providing a type of demerit to reduce the same brand from showing up in the search results more than 5 times. For the record I’m using a fairly standard DisMax search handler.

This logic would only be applied to extremely broad queries like ‘DVD Players’, or ‘Hard Drives’, and naturally I wouldn’t use it to shape ‘Samsung DVD Players’ search results.

I don’t know if SOLR has a nifty feature that does this automatically, or if I would have to start modifying search handler logic.

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1 Answer

  1. Editorial Team

    To achieve this is a lengthy and complex process but worth trying. Let’s say the main field on which you are searching is a single field called title, first you’ll need to make sure that all the documents containing “dvd player” in it have same score. This you can do by neglecting solr scoring parameteres like field norm (set omitNorms=true) & term frequency (write a solr plugin to neglect it) code attached..

    Implementation Details:

    1) compile the following class and put it into Solr WEB-INF/classes

    package my.package; 
import org.apache.lucene.search.DefaultSimilarity;

public class CustomSimilarity extends DefaultSimilarity {

public float tf(float freq) {
    return freq > 0 ? 1.0f : 0.0f;
}

}
    1. In solrconfig.xml use this new similarity class add

    similarity class=”my.package.CustomSimilarity”

    All this will help you to make score for all the documents with “dvd player” in their title same. After that you can define one field of random type. Then when you query solr you can arrange first by score, then by the random field. Since score for all the documents containing DVD players would be same, results will get arranged by random field, giving the customer better variety of products in your catalog.

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