I'm not sure how it came to be, but it looks like my _internal index's cold path has changed. This left a bunch of cold buckets in the old location which seems unreferenced by any index as seen by | dbinspect index=* .
As noted here:
https://answers.splunk.com/answers/108941/deleting-a-bucket.html#answer-108942
hot/warm/cold buckets should not be removed while the server is running, but in this case, it seems it can be done. Can someone confirm?
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