question: public void prune ( ) throws IOException { DeletionInfo deletionInfo = cf . deletionInfo ( ) ; if ( ! deletionInfo . isLive ( ) ) { if ( deletionInfo . hasRanges ( ) ) { Iterator < RangeTombstone > it = deletionInfo . rangeIterator ( ) ; while ( it . hasNext ( ) ) { RangeTombstone rangeTombstone = it . next ( ) ; logger . trace ( "delete rangeTombstone (not implemented) " + getIndexName ( ) + " cf=" + metadata . ksName + "." + metadata . cfName + " min=" + rangeTombstone . min + " max=" + rangeTombstone . max ) ; } } else { delete ( ) ; } } }
target:  Delete tombstones in ES index.