code: @Override
    public List<byte[]> configGet(final byte[] pattern) {
      checkIsInMultiOrPipeline();
      client.configGet(pattern);
      return client.getBinaryMultiBulkReply();
    }
docs: Retrieve the configuration of a running Redis server. Not all the configuration parameters are
  supported.
  <p>
  CONFIG GET returns the current configuration parameters. This sub command only accepts a single
  argument, that is glob style pattern. All the configuration parameters matching this parameter
  are reported as a list of key-value pairs.
  <p>
  <b>Example:</b>
  
  <pre>
  $ redis-cli config get '*'
  1. "dbfilename"
  2. "dump.rdb"
  3. "requirepass"
  4. (nil)
  5. "masterauth"
  6. (nil)
  7. "maxmemory"
  8. "0\n"
  9. "appendfsync"
  10. "everysec"
  11. "save"
  12. "3600 1 300 100 60 10000"
  
  $ redis-cli config get 'm*'
  1. "masterauth"
  2. (nil)
  3. "maxmemory"
  4. "0\n"
  </pre>
  @param pattern
  @return Bulk reply.