After update from 2.8 to 3.02 (new build of indexes, because the convert tool also not works on windows) rotating does not working…
[Sat Jun 22 17:55:10.755 2019] [2720] WARNING: rotating index 'tWls': cur to old rename failed: rename d:/sphIndex/tWls.spd to d:/sphIndex/tWls.old.spd failed: Broken pipe
the issue was fixed at master version commit 5cf6741fd68e4d9c8803aadcf6410c5d3205cbd0 and fix will be released this release. Or you could build your binary from source code on you own.