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
public void authenticationSuccess(String requestId, Authentication authentication, String action, TransportRequest transportRequest) {
        if (events.contains(AUTHENTICATION_SUCCESS)) {
            final Optional<String[]> indices = indices(transportRequest);
            if (eventFilterPolicyRegistry.ignorePredicate()
                .test(
                    new AuditEventMetaInfo(
                        Optional.of(authentication.getUser()),
                        
                        Optional.ofNullable(ApiKeyService.getCreatorRealmName(authentication)),
                        Optional.empty(),
                        indices,
                        Optional.of(action)
                    )
                ) == false) {
                new LogEntryBuilder().with(EVENT_TYPE_FIELD_NAME, TRANSPORT_ORIGIN_FIELD_VALUE)
                    .with(EVENT_ACTION_FIELD_NAME, "authentication_success")
                    .with(ACTION_FIELD_NAME, action)
                    .with(REQUEST_NAME_FIELD_NAME, transportRequest.getClass().getSimpleName())
                    .withRequestId(requestId)
                    .withAuthentication(authentication)
                    .withRestOrTransportOrigin(transportRequest, threadContext)
                    .with(INDICES_FIELD_NAME, indices.orElse(null))
                    .withThreadContext(threadContext)
                    .build();
            }
        }
    }
    @Override
    public void anonymousAccessDenied(String requestId, String action, TransportRequest transportRequest) {
        if (events.contains(ANONYMOUS_ACCESS_DENIED)) {