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
Collections.singletonList("*"),
            Function.identity(),
            value -> EventFilterPolicy.parsePredicate(value),
            Property.NodeScope,
            Property.Dynamic
        )
    );
    private static final Marker AUDIT_MARKER = MarkerManager.getMarker("org.elasticsearch.xpack.security.audit");
    private final Logger logger;
    private final ThreadContext threadContext;
    final EventFilterPolicyRegistry eventFilterPolicyRegistry;
    
    volatile EnumSet<AuditLevel> events;
    boolean includeRequestBody;
    
    EntryCommonFields entryCommonFields;
    @Override
    public String name() {
        return NAME;
    }
    public LoggingAuditTrail(Settings settings, ClusterService clusterService, ThreadPool threadPool) {
        this(settings, clusterService, LogManager.getLogger(LoggingAuditTrail.class), threadPool.getThreadContext());
    }
    LoggingAuditTrail(Settings settings, ClusterService clusterService, Logger logger, ThreadContext threadContext) {
        this.logger = logger;
        this.events = parse(INCLUDE_EVENT_SETTINGS.get(settings), EXCLUDE_EVENT_SETTINGS.get(settings));
        this.includeRequestBody = INCLUDE_REQUEST_BODY.get(settings);
        this.threadContext = threadContext;
        this.entryCommonFields = new EntryCommonFields(settings, null, clusterService);
        this.eventFilterPolicyRegistry = new EventFilterPolicyRegistry(settings);