private static void appendAsHex(byte[] gid, StringBuilder sb) {
        for (byte b : gid) {
            String hex = Integer.toHexString(0xFF & b);
            if (hex.length() == 1) {
                sb.append('0');
            }
            sb.append(hex);
        }
    }
Returns whether any fields are present <b>in the field map in the parent hit</b>
container-search/src/main/java/com/yahoo/prelude/fastsearch/FastHit.java