Minor Description
When cleanfile cleans up data, it cleans up all the carbonindex and carbonmergeindex that once existed, even though many carbonindex have been all deleted, which have been merged into carbonergeindex. considering that there are tens of thousands of carbonindex that once existed after the completion of the compaction, the clean file command will take serveral hours.
Here, we just need to clean up the existing files, carbonmergeindex or carbonindex files
