### Description

The `sendRequest` method is asynchronous and notifies a 
`TransportResponseHandler` when it completes the excecution
(successfully or unsuccessfully). 

When opening the connection we only catch `NodeNotConnectedException`
( https://github.com/elastic/elasticsearch/blob/main/server/src/main/java/org/elasticsearch/transport/TransportService.java#L719 ) which is currently fine as no implementations
throw other type of exception however, it'd be best to catch `Exception` here
so the `handler` gets notified of potential exceptions (as opposed to the caller
having to `try/catch` the call to `sendRequest`)
server/src/main/java/org/elasticsearch/transport/TransportService.java
e
            );
        }
        @Override
        public void writeTo(StreamOutput out) throws IOException {
            Version.writeVersion(version, out);
            out.writeString(buildHash);
            discoveryNode.writeTo(out);
            clusterName.writeTo(out);
        }
        public Version getVersion() {
            return version;
        }
        public String getBuildHash() {
            return buildHash;
        }
        public DiscoveryNode getDiscoveryNode() {
            return discoveryNode;
        }
        public ClusterName getClusterName() {
            return clusterName;
        }
        private static boolean isIncompatibleBuild(Version version, String buildHash) {
            return version == Version.CURRENT && Build.CURRENT.hash().equals(buildHash) == false;
        }
    }
    public void disconnectFromNode(DiscoveryNode node) {
        if (isLocalNode(node)) {
            return;
        }