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
935279688,MDExOlB1bGxSZXF1ZXN0NjgyMjIzODA2,5560,conditionally disable bottleneck,14808389,closed,0,,,7,2021-07-01T23:12:03Z,2021-08-12T15:05:48Z,2021-08-12T14:41:34Z,MEMBER,,0,pydata/xarray/pulls/5560,"As this came up in #5424 (and because I can't seem to reliably reproduce expected values in #4972 if it is enabled) this adds a option to disable `bottleneck`, even if it is installed.

In #5424 it was suggested to also allow replacing `bottleneck` with `numbagg`. If that's something we want (and `numbagg` supports the operations we need) I can try looking into renaming the new option to something like `xr.set_options(accelerate_with=""bottleneck"")` (or something else, if someone has a great idea).

Tests are missing because I have no idea how to check that this works (except by mocking bottleneck).

- [x] Closes #5424
- [x] Tests added
- [x] Passes `pre-commit run --all-files`
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
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