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11 changes: 5 additions & 6 deletions docs/reference/mapping/params/similarity.asciidoc
Original file line number Diff line number Diff line change
Expand Up @@ -16,14 +16,13 @@ The only similarities which can be used out of the box, without any further
configuration are:

`BM25`::
The Okapi BM25 algorithm. The algorithm used by default in Elasticsearch and Lucene.
See {defguide}/pluggable-similarites.html[Pluggable Similarity Algorithms]
for more information.
The https://en.wikipedia.org/wiki/Okapi_BM25[Okapi BM25 algorithm]. The
algorithm used by default in {es} and Lucene.

`classic`::
The TF/IDF algorithm which used to be the default in Elasticsearch and
Lucene. See {defguide}/practical-scoring-function.html[Lucene’s Practical Scoring Function]
for more information.
deprecated:[7.0.0]
The https://en.wikipedia.org/wiki/Tf%E2%80%93idf[TF/IDF algorithm], the former
default in {es} and Lucene.

`boolean`::
A simple boolean similarity, which is used when full-text ranking is not needed
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