Fixed #26285 -- Deprecated the MySQL-specific __search lookup.

docs/internals/deprecation.txt

@@ -141,6 +141,9 @@ details on these changes.
 * Support for query lookups using the model name when
   ``Meta.default_related_name`` is set will be removed.
 
+* The ``__search`` query lookup and the
+  ``DatabaseOperations.fulltext_search_sql()`` method will be removed.
+
 .. _deprecation-removed-in-1.10:
 
 1.10

docs/ref/models/fields.txt

@@ -1847,15 +1847,8 @@ Field API reference
     .. method:: get_prep_lookup(lookup_type, value)
 
         Prepares ``value`` to the database prior to be used in a lookup.
-        The ``lookup_type`` will be one of the valid Django filter lookups:
-        ``"exact"``, ``"iexact"``, ``"contains"``, ``"icontains"``,
-        ``"gt"``, ``"gte"``, ``"lt"``, ``"lte"``, ``"in"``, ``"startswith"``,
-        ``"istartswith"``, ``"endswith"``, ``"iendswith"``, ``"range"``,
-        ``"year"``, ``"month"``, ``"day"``, ``"isnull"``, ``"search"``,
-        ``"regex"``, and ``"iregex"``.
-
-        If you are using :doc:`Custom lookups </ref/models/lookups>` the
-        ``lookup_type`` can be any ``lookup_name`` registered in the field.
+        The ``lookup_type`` will be the registered name of the lookup. For
+        example: ``"exact"``, ``"iexact"``, or ``"contains"``.
 
         See :ref:`preparing-values-for-use-in-database-lookups` for usage.
 

docs/ref/models/querysets.txt

@@ -2771,6 +2771,11 @@ SQL equivalent::
 ``search``
 ~~~~~~~~~~
 
+.. deprecated:: 1.10
+
+    See :ref:`the 1.10 release notes <search-lookup-replacement>` for how to
+    replace it.
+
 A boolean full-text search, taking advantage of full-text indexing. This is
 like :lookup:`contains` but is significantly faster due to full-text indexing.
 

docs/releases/1.10.txt

@@ -740,6 +740,28 @@ use the default_related_name ``bars``::
 
     >>> Foo.object.get(bars=bar)
 
+.. _search-lookup-replacement:
+
+``__search`` query lookup
+-------------------------
+
+The ``search`` lookup, which supports MySQL only and is extremely limited in
+features, is deprecated. Replace it with a custom lookup::
+
+    from django.db import models
+
+    class Search(models.Lookup):
+        lookup_name = 'search'
+
+        def as_mysql(self, compiler, connection):
+            lhs, lhs_params = self.process_lhs(compiler, connection)
+            rhs, rhs_params = self.process_rhs(compiler, connection)
+            params = lhs_params + rhs_params
+            return 'MATCH (%s) AGAINST (%s IN BOOLEAN MODE)' % (lhs, rhs), params
+
+    models.CharField.register_lookup(Search)
+    models.TextField.register_lookup(Search)
+
 Miscellaneous
 -------------