Some types of audit event samples from [our documentation](https://www.elastic.co/guide/en/elasticsearch/reference/7.17/audit-event-types.html) include the port number in "origin.address", like **access_denied**:
```json
{"type":"audit", "timestamp":"2020-12-30T22:30:06,949+0200", "node.id":
"0RMNyghkQYCc_gVd1G6tZQ", "event.type":"transport", "event.action":
"access_denied", "authentication.type":"REALM", "user.name":"user1",
"user.realm":"default_native", "user.roles":["test_role"], "origin.type":
"rest", "origin.address":"[::1]:52434", "request.id":"yKOgWn2CRQCKYgZRz3phJw",
"action":"indices:admin/auto_create", "request.name":"CreateIndexRequest",
"indices":["<index-{now/d+1d}>"]}
```
but other types like **connection_denied** from this issue does not include the port:

```json
{"type":"audit", "timestamp":"2020-12-30T21:47:31,526+0200", "node.id":
"0RMNyghkQYCc_gVd1G6tZQ", "event.type":"ip_filter", "event.action":
"connection_denied", "origin.type":"rest", "origin.address":"10.10.0.20",
"transport.profile":".http", "rule":"deny 10.10.0.0/16"}
```

I think we should be consistent here and always include the port number in the "origin.address" field.
x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/audit/logfile/LoggingAuditTrail.java
Optional<String> action
        ) {
            this.principal = authenticationToken.map(u -> u.principal()).orElse("");
            this.realm = realm.orElse("");
            this.action = action.orElse("");
            this.roles = () -> Stream.of("");
            this.indices = () -> indices.filter(r -> r.length != 0).map(i -> Arrays.stream(i)).orElse(Stream.of(""));
        }
    }
    @Override
    public void clusterChanged(ClusterChangedEvent event) {
        updateLocalNodeInfo(event.state().getNodes().getLocalNode());
    }
    void updateLocalNodeInfo(DiscoveryNode newLocalNode) {
        
        final EntryCommonFields localNodeInfo = this.entryCommonFields;
        if (localNodeInfo.localNode == null || localNodeInfo.localNode.equals(newLocalNode) == false) {
            
            this.entryCommonFields = this.entryCommonFields.withNewLocalNode(newLocalNode);
        }
    }
    static class EntryCommonFields {
        private final Settings settings;
        private final DiscoveryNode localNode;
        private final ClusterService clusterService;
        final Map<String, String> commonFields;
        EntryCommonFields(Settings settings, @Nullable DiscoveryNode newLocalNode, ClusterService clusterService) {
            this.settings = settings;
            this.localNode = newLocalNode;
            this.clusterService = clusterService;