code: @Override
    public byte[] hget(final byte[] key, final byte[] field) {
      checkIsInMultiOrPipeline();
      client.hget(key, field);
      return client.getBinaryBulkReply();
    }
docs: If key holds a hash, retrieve the value associated to the specified field.
  <p>
  If the field is not found or the key does not exist, a special 'nil' value is returned.
  <p>
  <b>Time complexity:</b> O(1)
  @param key
  @param field
  @return Bulk reply