I have an existing index for which the default ElasticSearch similarity is
used for all fields. I would like to update this index and set some other
type of similarity, like BM25. The query I tried is:
curl -XPOST 'http://localhost:9200/myindex/' -d
You cannot change the similarity on an existing index. There is no
technical measure why it could not occur, it appears to be simply a method
in place to prevent users from creating potentially huge errors. I say that
developers should have the option to shoot themselves in the foot!
Cheers,
