No you can not restore the data, I think, at least not easily. As I've understood it, the delete command will wipe those parts of the .tsidx file that refers to the data you want to delete (but not the data itself).
However, if that is the case, perhaps there is some way of rebuilding the .tsidx from the .gz file?
Isn't that what's being done when thawing frozen buckets, i.e. rebuild?
I had a test,I found the delete command didnot delete the .tsidx,It just move the hot data to a db_1342886374_1342282020_0,just like move to a warm db,but add a lot of other directories,such as deletes.So I think it maybe can restore?????However, I can reindex the data again use the raw data.