code: public void delete(String cfName, WriteOptions writeOptions, String key)
              throws RocksDbException {
          if (cfName == null) {
              cfName = DEFAULT_COLUMN_FAMILY;
          }
          try {
              delete(getColumnFamilyHandle(cfName), writeOptions,
                      key.getBytes(StandardCharsets.UTF_8));
          } catch (RocksDbException.ColumnFamilyNotExists e) {
              throw new RocksDbException.ColumnFamilyNotExists(cfName);
          }
      }
docs: Deletes a key from a column family, specifying write options.
  
  @param cfName
  @param writeOptions
  @param key
  @throws RocksDBException