issues: 442063346

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
442063346 MDU6SXNzdWU0NDIwNjMzNDY= 2949 xr.DataArray.to_series returns a (mutable) view 881019 open 0     8 2019-05-09T06:02:23Z 2020-11-16T21:58:10Z   NONE      

Code Sample, a copy-pastable example if possible

```python import numpy as np import pandas as pd import xarray as xr

dates = pd.date_range('01-Jan-2019', '01-Jan-2020', name='forward_date')[:-1] s = pd.Series(np.random.randn(dates.size), dates) array = xr.DataArray.from_series(s) python In [52]: array Out[52]: <xarray.DataArray (forward_date: 365)> array([ 0.511149, -1.009054, -0.098397, ..., 0.496596, 1.435346, 0.21206 ]) Coordinates: * forward_date (forward_date) datetime64[ns] 2019-01-01 ... 2019-12-31

In [53]: array.to_series().index.name Out[53]: 'forward_date'

In [54]: array.to_series().index.name = 'peristent!!!'

In [55]: array.to_series().index.name Out[55]: 'peristent!!!'

In [56]: array.get_index('forward_date') Out[56]: DatetimeIndex(['2019-01-01', '2019-01-02', '2019-01-03', '2019-01-04', '2019-01-05', '2019-01-06', '2019-01-07', '2019-01-08', '2019-01-09', '2019-01-10', ... '2019-12-22', '2019-12-23', '2019-12-24', '2019-12-25', '2019-12-26', '2019-12-27', '2019-12-28', '2019-12-29', '2019-12-30', '2019-12-31'], dtype='datetime64[ns]', name='peristent!!!', length=365, freq='D') ```

Problem description

IMHO Setting index.name on the returned series shouldn't affect the original DataArray - i.e. every call to array.to_series().index.name should return forward_date irrespective of any mutating operations performed on the returned series.

Expected Output

Output of xr.show_versions()

```python In [48]: xr.show_versions() Traceback (most recent call last): File "<ipython-input-48-6f391305f2fe>", line 1, in <module> xr.show_versions() File "C:\Users\dhirschf\envs\dev\lib\site-packages\xarray\util\print_versions.py", line 84, in show_versions sys_info.extend(netcdf_and_hdf5_versions()) File "C:\Users\dhirschf\envs\dev\lib\site-packages\xarray\util\print_versions.py", line 75, in netcdf_and_hdf5_versions libhdf5_version = h5py.__hdf5libversion__ AttributeError: module 'h5py' has no attribute '__hdf5libversion__' ``` 
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     13221727 issue

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