Fixed #35075 -- Added deduplicate_items parameter to BTreeIndex.

docs/ref/contrib/postgres/indexes.txt

@@ -46,14 +46,23 @@ available from the ``django.contrib.postgres.indexes`` module.
 ``BTreeIndex``
 ==============
 
-.. class:: BTreeIndex(*expressions, fillfactor=None, **options)
+.. class:: BTreeIndex(*expressions, fillfactor=None, deduplicate_items=None, **options)
 
     Creates a B-Tree index.
 
     Provide an integer value from 10 to 100 to the fillfactor_ parameter to
     tune how packed the index pages will be. PostgreSQL's default is 90.
 
+    Provide a boolean value to the deduplicate_items_ parameter to control
+    whether deduplication is enabled. PostgreSQL enables deduplication by
+    default.
+
+    .. versionchanged:: 5.1
+
+        The ``deduplicate_items`` parameter was added.
+
     .. _fillfactor: https://www.postgresql.org/docs/current/sql-createindex.html#SQL-CREATEINDEX-STORAGE-PARAMETERS
+    .. _deduplicate_items: https://www.postgresql.org/docs/current/btree-implementation.html#BTREE-DEDUPLICATION
 
 ``GinIndex``
 ============

docs/releases/5.1.txt

@@ -63,7 +63,8 @@ Minor features
 :mod:`django.contrib.postgres`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-* ...
+* :class:`~django.contrib.postgres.indexes.BTreeIndex` now supports the
+  ``deduplicate_items`` parameter.
 
 :mod:`django.contrib.redirects`
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

docs/spelling_wordlist

@@ -119,6 +119,7 @@ datetimes
 declaratively
 decrementing
 deduplicates
+deduplication
 deepcopy
 deferrable
 deprecations