What is default similarity in Elasticsearch 5

Elastic Stack Elasticsearch
1

I have been trouble to find what is the default similarity in Elasticsearch 5
is BM25 or Classic Lucene IF/IDF?

2

The default in 5.0 is BM25. See https://www.elastic.co/guide/en/elasticsearch/reference/5.0/similarity.html for more details

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3

so if I want to use TF/IDF then am I correct with below code?

'similarity' => [
'default' => [
'type' => 'classic',
],
],

is classic point out to TF/IDF?

4

Yes classic indicates that you want to use TF/IDF. information on setting the default similarity can be found here: https://www.elastic.co/guide/en/elasticsearch/reference/5.0/index-modules-similarity.html#default-base

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5

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