The alias is switched to point to the new index (#21512)

If the index satisfies the specified conditions then a new index is created and the alias is switched to point to the new index.

docs/reference/indices/rollover-index.asciidoc

@@ -7,7 +7,7 @@ index is considered to be too large or too old.
 The API accepts a single alias name and a list of `conditions`.  The alias
 must point to a single index only.  If the index satisfies the specified
 conditions then a new index is created and the alias is switched to point to
-the new alias.
+the new index.
 
 
 [source,js]