AndreyBozhko commented on code in PR #1961:
URL: https://github.com/apache/solr/pull/1961#discussion_r1341570910
##########
solr/solr-ref-guide/modules/indexing-guide/pages/schema-elements.adoc:
##########
@@ -95,18 +95,23 @@ However, `uniqueKey` will continue to work, as long as the
field is properly use
Similarity is a Lucene class used to score a document in searching.
Each collection has one "global" Similarity.
-By default Solr uses an implicit
{solr-javadocs}/core/org/apache/solr/search/similarities/SchemaSimilarityFactory.html[`SchemaSimilarityFactory`]
which allows individual field types to be configured with a "per-type"
specific Similarity and implicitly uses `BM25Similarity` for any field type
which does not have an explicit Similarity.
+By default, Solr uses an implicit
{solr-javadocs}/core/org/apache/solr/search/similarities/SchemaSimilarityFactory.html[`SchemaSimilarityFactory`]
which allows individual field types to be configured with a "per-type"
specific Similarity and implicitly uses `BM25Similarity` for any field type
which does not have an explicit Similarity.
This default behavior can be overridden by declaring a top level
`<similarity/>` element in your schema, outside of any single field type.
This similarity declaration can either refer directly to the name of a class
with a no-argument constructor, such as in this example showing
`BM25Similarity`:
[source,xml]
----
-<similarity class="solr.BM25SimilarityFactory"/>
+<similarity class="org.apache.lucene.search.similarities.BM25Similarity"/>
Review Comment:
Here, I just updated the xml snippets - so if the text says `in this example
showing BM25Similarity`, the example indeed uses the similarity directly and
not the factory. I tried writing this snippet as
```xml
<similarity class="solr.BM25Similarity"/>
```
at first - but it seems like if the similarity class is from Lucene, the
`solr.` shorthand doesn't work.
And the original xml snippet (that was using the similarity factory) now
appears after the text that talks about similarity factories.
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