Depending on the ES version, it either does TF/IDF (older versions) or BM25 (newer versions) by default. You have to explicitly disable it if you don't want it.

Depending on the ES version, it either does TF/IDF (older versions) or BM25 (newer versions) by default. You have to explicitly disable it if you don't want it. https://www.elastic.co/guide/en/elasticsearch/reference/current/index-modules-similarity.html https://www.elastic.co/guide/en/elasticsearch/reference/curr...