fix ut

Author: airborne12

be/test/olap/rowset/segment_v2/inverted_index_file_writer_test.cpp

@@ -692,9 +692,8 @@ class IndexStorageFormatV2MockCreateOutputStream : public IndexStorageFormatV2 {
     IndexStorageFormatV2MockCreateOutputStream(IndexFileWriter* index_file_writer)
             : IndexStorageFormatV2(index_file_writer) {}
 
-    MOCK_METHOD((std::pair<std::unique_ptr<lucene::store::Directory, DirectoryDeleter>,
-                           std::unique_ptr<lucene::store::IndexOutput>>),
-                create_output_stream, (), (override));
+    MOCK_METHOD((std::unique_ptr<lucene::store::IndexOutput>), create_output_stream, (),
+                (override));
 };
 
 class IndexFileWriterMockCreateOutputStreamV1 : public IndexFileWriter {