Upload indexes under their uuids

crates/milli/src/index.rs

@@ -425,6 +425,10 @@ impl Index {
         self.env.info().map_size
     }
 
+    pub fn try_clone_inner_file(&self) -> Result<File> {
+        Ok(self.env.try_clone_inner_file()?)
+    }
+
     pub fn copy_to_file(&self, file: &mut File, option: CompactionOption) -> Result<()> {
         self.env.copy_to_file(file, option).map_err(Into::into)
     }