Method dirtyUUID

server/src/main/java/org/elasticsearch/common/UUIDs.java:41–44

Similar to UUID#randomUUID() but: Uses ThreadLocalRandom instead of SecureRandom Doesn't return a UUID4, in fact it doesn't follow the UUID structure at all. It's just two random longs.

()

     * </ul>
     **/
    public static UUID dirtyUUID() {
        var random = ThreadLocalRandom.current();
        return new UUID(random.nextLong(), random.nextLong());
    }

    /** Generates a time-based UUID (similar to Flake IDs), which is preferred when generating an ID to be indexed into a Lucene index as
     *  primary key.  The id is opaque and the implementation is free to change at any time! */