Update similarity measure for existing index

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 '{"settings":{"similarity":{"newSimilarity":{"type":"BM25"}}}}'

However, this crashes with an IndexAlreadyExists exception. Still, is it
possible to update the similarity measure for all fields inside this index
without having to reindex the data?

Thanks!

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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,

Ivan

On Thu, Oct 9, 2014 at 6:58 AM, CC cr1st1na.garbacea@gmail.com wrote:

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 '{"settings":{"similarity":{"newSimilarity":{"type":"BM25"}}}}'

However, this crashes with an IndexAlreadyExists exception. Still, is it
possible to update the similarity measure for all fields inside this index
without having to reindex the data?

Thanks!

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