### 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/cluster/coordination/CoordinationDiagnosticsService.java
entry.getKey().getName()
                    ),
                    getDetails(
                        explain,
                        localMasterHistory,
                        remoteException,
                        Map.of(coordinator.getLocalNode().getId(), coordinator.getClusterFormationState().getDescription())
                    )
                );
            }
        }
        Map<DiscoveryNode, ClusterFormationFailureHelper.ClusterFormationState> nodeClusterFormationStateMap =
            nodeToClusterFormationResponses.entrySet()
                .stream()
                .collect(Collectors.toMap(Map.Entry::getKey, entry -> entry.getValue().clusterFormationState()));
        if (nodeClusterFormationStateMap.isEmpty()) {
            /*
            * The most likely reason we are here is that polling for cluster formation info never began because there has been no cluster
            * changed event because there has never been a master node. So we just use the local cluster formation state.
            */
            nodeClusterFormationStateMap = Map.of(coordinator.getLocalNode(), coordinator.getClusterFormationState());
        }
        Map<String, String> nodeIdToClusterFormationDescription = nodeClusterFormationStateMap.entrySet()
            .stream()
            .collect(Collectors.toMap(entry -> entry.getKey().getId(), entry -> entry.getValue().getDescription()));
        if (anyNodeInClusterReportsDiscoveryProblems(masterEligibleNodes, nodeClusterFormationStateMap)) {
            result = new CoordinationDiagnosticsResult(
                CoordinationDiagnosticsStatus.RED,
                String.format(
                    Locale.ROOT,