api/java/src/main/java/com/navercorp/redis/cluster/spring/AbstractOperations.java
@SuppressWarnings("unchecked")
    <HK> byte[] rawHashKey(HK hashKey) {
        Assert.notNull(hashKey, "non null hash key required");
        return hashKeySerializer().serialize(hashKey);
    }
@SuppressWarnings("unchecked")
    <HK> byte[] rawHashKey(HK hashKey) {
        Assert.notNull(hashKey, "non null hash key required");
        return hashKeySerializer().serialize(hashKey);
    }
Raw hash key.

@param <HK>    the generic type
@param hashKey the hash key
@return the byte[]