Hi, It is not possible in general because similarities are computing norms at index time. ( https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/search/similarities/Similarity.java#L46 ) My understanding is that you should double a field and set different similarity to the new field in order to be able to change similarity for every query. If someone has a better idea, I am also interested.
On Thu, Jul 26, 2018 at 8:51 AM Reem <reem.suwai...@gmail.com> wrote: > Hello, > > Is it possible to change the ranking function (e.g., BM25Similarity, > ClassicSimilarity, LMDirichletSimilarity, etc) in search time? > > The way I found to change the ranking function is by setting the > similarity property of text fields in schema.xml as follows: > `<similarity class="solr.LMDirichletSimilarityFactory"/>` > > However, this means we can only set the similarity/ranking function only > in indexing time. As Solr is built over Lucene which allows changing the > ranking function in search time, I find it not logical that Solr doesn’t > support it, so it seems I’m missing something here! > > Any idea on how to achieve this? > > Reem >
