html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/6946#issuecomment-1240904315,https://api.github.com/repos/pydata/xarray/issues/6946,1240904315,IC_kwDOAMm_X85J9rJ7,20629530,2022-09-08T15:51:15Z,2022-09-08T15:51:27Z,CONTRIBUTOR,"I found another problem that this issue causes : the dataset can't be written to netCDF and the error message suggests exactly what has already been done:
```python
import xarray as xr
ds = xr.tutorial.open_dataset('air_temperature')

ds = ds.stack(spatial=['lon', 'lat'])
ds = ds.reset_index('spatial', drop=True)  

ds.to_netcdf('test.nc')
```
raises:
```
NotImplementedError: variable 'lat' is a MultiIndex, which cannot yet be serialized to netCDF files (https://github.com/pydata/xarray/issues/1077). Use reset_index() to convert MultiIndex levels into coordinate variables instead.
```

@benbovy I'm guessing your PR will fix this, but I'm raising the issue to be sure.



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