code: @Override
    public Long hincrBy(final byte[] key, final byte[] field, final long value) {
      checkIsInMultiOrPipeline();
      client.hincrBy(key, field, value);
      return client.getIntegerReply();
    }
docs: Increment the number stored at field in the hash at key by value. If key does not exist, a new
  key holding a hash is created. If field does not exist or holds a string, the value is set to 0
  before applying the operation. Since the value argument is signed you can use this command to
  perform both increments and decrements.
  <p>
  The range of values supported by HINCRBY is limited to 64 bit signed integers.
  <p>
  <b>Time complexity:</b> O(1)
  @param key
  @param field
  @param value
  @return Integer reply The new value at field after the increment operation.