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/test/java/org/elasticsearch/xpack/security/audit/logfile/LoggingAuditTrailTests.java
new Tuple<>(InvalidateApiKeyAction.NAME, new InvalidateApiKeyRequest()),
            new Tuple<>(DeletePrivilegesAction.NAME, new DeletePrivilegesRequest()),
            new Tuple<>(CreateServiceAccountTokenAction.NAME, new CreateServiceAccountTokenRequest(namespace, serviceName, tokenName)),
            new Tuple<>(DeleteServiceAccountTokenAction.NAME, new DeleteServiceAccountTokenRequest(namespace, serviceName, tokenName)),
            new Tuple<>(ActivateProfileAction.NAME, new ActivateProfileRequest()),
            new Tuple<>(
                UpdateProfileDataAction.NAME,
                new UpdateProfileDataRequest(randomAlphaOfLength(20), Map.of(), Map.of(), -1, -1, WriteRequest.RefreshPolicy.WAIT_UNTIL)
            ),
            new Tuple<>(
                SetProfileEnabledAction.NAME,
                new SetProfileEnabledRequest(randomAlphaOfLength(20), randomBoolean(), WriteRequest.RefreshPolicy.WAIT_UNTIL)
            )
        );
        auditTrail.accessGranted(requestId, authentication, actionAndRequest.v1(), actionAndRequest.v2(), authorizationInfo);
        List<String> output = CapturingLogger.output(logger.getName(), Level.INFO);
        assertThat(output.size(), is(2));
        assertThat(output.get(1), containsString("security_config_change"));
        CapturingLogger.output(logger.getName(), Level.INFO).clear();
        updateLoggerSettings(
            Settings.builder().put(settings).put("xpack.security.audit.logfile.events.exclude", "security_config_change").build()
        );
        auditTrail.accessGranted(requestId, authentication, actionAndRequest.v1(), actionAndRequest.v2(), authorizationInfo);
        output = CapturingLogger.output(logger.getName(), Level.INFO);
        assertThat(output.size(), is(1));
        assertThat(output.get(0), not(containsString("security_config_change")));
        CapturingLogger.output(logger.getName(), Level.INFO).clear();
        updateLoggerSettings(
            Settings.builder()
                .put(settings)