# Changing similarities **URL:** \ **Category:** Elasticsearch\ **Created:** [December 6, 2013, 12:32am UTC](https://discuss.elastic.co/t/changing-similarities/14742 "2013-12-06T00:32:06Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Ivan](https://avatars.discourse-cdn.com/v4/letter/i/df788c/32.png) [@Ivan](https://discuss.elastic.co/u/Ivan)\ **Post date:** [December 6, 2013, 12:32am UTC](https://discuss.elastic.co/t/changing-similarities/14742/1 "2013-12-06T00:32:06Z")
Perhaps more of a Lucene-level question, but perhaps elasticsearch provides a workaround. I am currently using document-level boosts, which really translates to changing the norm for every field under the covers. As part of an experiment, I want to use a custom scoring script, but that would require either re-indexing content without the boosts or changing the scoring algorithm (similarity). If I create my own similarity, which would be identical to the default/TFIDF similarity but with the norm hardcoded to 1.0. The Lucene source warns against such behaviour. I am assuming this is because computeNorm is only run at index time,but shouldn't I be able to override score() and ignore the decodeNormValue calculation? Just some thoughts for now. Creating a plugin for a custom similarity is easy, but I will not go down that path if my thinking is incorrect. Cheers, Ivan -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQB1g%2BPKSGr86%3DBoYgTV-WR9ZSuFjtaeJ7-YQoedU5aeaQ%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CALY%3DcQB1g%2BPKSGr86%3DBoYgTV-WR9ZSuFjtaeJ7-YQoedU5aeaQ%40mail.gmail.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 2:02am UTC](https://discuss.elastic.co/t/changing-similarities/14742/2 "2017-07-06T02:02:58Z")