public static long hash64(byte[] data) {
        return hash64(data, 0, data.length, DEFAULT_SEED);
    }
Murmur3 64-bit variant. This is essentially MSB 8 bytes of Murmur3 128-bit variant.

@param data - input byte array
@return - hashcode
streams/src/main/java/org/apache/kafka/streams/state/internals/Murmur3.java