Gunakan CreateDBCluster dengan AWS SDK

    /**
     * Creates a new Amazon Neptune DB cluster asynchronously.
     *
     * @param dbName the name of the DB cluster to be created
     * @return a CompletableFuture that, when completed, provides the ID of the created DB cluster
     * @throws CompletionException if the operation fails for any reason, including if the request would exceed the maximum quota
     */
    public CompletableFuture<String> createDBClusterAsync(String dbName) {
        CreateDbClusterRequest request = CreateDbClusterRequest.builder()
                .dbClusterIdentifier(dbName)
                .engine("neptune")
                .deletionProtection(false)
                .backupRetentionPeriod(1)
                .build();

        return getAsyncClient().createDBCluster(request)
                .whenComplete((response, exception) -> {
                    if (exception != null) {
                        Throwable cause = exception.getCause();
                        if (cause instanceof ServiceQuotaExceededException) {
                            throw new CompletionException("The operation was denied because the request would exceed the maximum quota.", cause);
                        }
                        throw new CompletionException("Failed to create Neptune DB cluster: " + exception.getMessage(), exception);
                    }
                })
                .thenApply(response -> {
                    String clusterId = response.dbCluster().dbClusterIdentifier();
                    logger.info("DB Cluster created: " + clusterId);
                    return clusterId;
                });
    }