public CompletableFuture<Void> closeAsync() {
        return manager.close().thenRun(() -> logger.info("Closed Cluster for hosts [{}]", this));
    }
Create a {@code Cluster} using a YAML-based configuration file.
First try to read the file from the file system and then from resources.
gremlin-driver/src/main/java/org/apache/tinkerpop/gremlin/driver/Cluster.java