Adding whatsnew

Author: alexhlim

doc/source/whatsnew/v1.1.0.rst

@@ -1015,6 +1015,7 @@ Indexing
 - Bug in :meth:`Series.loc` when used with a :class:`MultiIndex` would raise an ``IndexingError`` when accessing a ``None`` value (:issue:`34318`)
 - Bug in :meth:`DataFrame.reset_index` and :meth:`Series.reset_index` would not preserve data types on an empty :class:`DataFrame` or :class:`Series` with a :class:`MultiIndex` (:issue:`19602`)
 - Bug in :class:`Series` and :class:`DataFrame` indexing with a ``time`` key on a :class:`DatetimeIndex` with ``NaT`` entries (:issue:`35114`)
+- Bug in :meth:`Index.get_indexer_non_unique` when index contains multiple ``np.nan`` (:issue:`35392`)
 
 Missing
 ^^^^^^^