remove drop_dups index option, deprecated with MongoDB3

mongoengine/base/metaclasses.py

@@ -284,7 +284,6 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
                 "indexes": [],  # indexes to be ensured at runtime
                 "id_field": None,
                 "index_background": False,
-                "index_drop_dups": False,
                 "index_opts": None,
                 "delete_rules": None,
                 # allow_inheritance can be True, False, and None. True means

mongoengine/document.py

@@ -851,17 +851,13 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
         index_spec = cls._build_index_spec(keys)
         index_spec = index_spec.copy()
         fields = index_spec.pop("fields")
-        drop_dups = kwargs.get("drop_dups", False)
-        if drop_dups:
-            msg = "drop_dups is deprecated and is removed when using PyMongo 3+."
-            warnings.warn(msg, DeprecationWarning)
         index_spec["background"] = background
         index_spec.update(kwargs)
 
         return cls._get_collection().create_index(fields, **index_spec)
 
     @classmethod
-    def ensure_index(cls, key_or_list, drop_dups=False, background=False, **kwargs):
+    def ensure_index(cls, key_or_list, background=False, **kwargs):
         """Ensure that the given indexes are in place. Deprecated in favour
         of create_index.
 
@@ -869,12 +865,7 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
             construct a multi-field index); keys may be prefixed with a **+**
             or a **-** to determine the index ordering
         :param background: Allows index creation in the background
-        :param drop_dups: Was removed/ignored with MongoDB >2.7.5. The value
-            will be removed if PyMongo3+ is used
         """
-        if drop_dups:
-            msg = "drop_dups is deprecated and is removed when using PyMongo 3+."
-            warnings.warn(msg, DeprecationWarning)
         return cls.create_index(key_or_list, background=background, **kwargs)
 
     @classmethod
@@ -887,12 +878,8 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
                   `auto_create_index` to False in the documents meta data
         """
         background = cls._meta.get("index_background", False)
-        drop_dups = cls._meta.get("index_drop_dups", False)
         index_opts = cls._meta.get("index_opts") or {}
         index_cls = cls._meta.get("index_cls", True)
-        if drop_dups:
-            msg = "drop_dups is deprecated and is removed when using PyMongo 3+."
-            warnings.warn(msg, DeprecationWarning)
 
         collection = cls._get_collection()
         # 746: when connection is via mongos, the read preference is not necessarily an indication that