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
this.eventFilterPolicyRegistry.set(policyName, newPolicy);
        }, (policyName, filtersList) -> EventFilterPolicy.parsePredicate(filtersList));
        clusterService.getClusterSettings().addAffixUpdateConsumer(FILTER_POLICY_IGNORE_ROLES, (policyName, filtersList) -> {
            final Optional<EventFilterPolicy> policy = eventFilterPolicyRegistry.get(policyName);
            final EventFilterPolicy newPolicy = policy.orElse(new EventFilterPolicy(policyName, settings)).changeRolesFilter(filtersList);
            this.eventFilterPolicyRegistry.set(policyName, newPolicy);
        }, (policyName, filtersList) -> EventFilterPolicy.parsePredicate(filtersList));
        clusterService.getClusterSettings().addAffixUpdateConsumer(FILTER_POLICY_IGNORE_INDICES, (policyName, filtersList) -> {
            final Optional<EventFilterPolicy> policy = eventFilterPolicyRegistry.get(policyName);
            final EventFilterPolicy newPolicy = policy.orElse(new EventFilterPolicy(policyName, settings)).changeIndicesFilter(filtersList);
            this.eventFilterPolicyRegistry.set(policyName, newPolicy);
        }, (policyName, filtersList) -> EventFilterPolicy.parsePredicate(filtersList));
        clusterService.getClusterSettings().addAffixUpdateConsumer(FILTER_POLICY_IGNORE_ACTIONS, (policyName, filtersList) -> {
            final Optional<EventFilterPolicy> policy = eventFilterPolicyRegistry.get(policyName);
            final EventFilterPolicy newPolicy = policy.orElse(new EventFilterPolicy(policyName, settings)).changeActionsFilter(filtersList);
            this.eventFilterPolicyRegistry.set(policyName, newPolicy);
        }, (policyName, filtersList) -> EventFilterPolicy.parsePredicate(filtersList));
        
        final LoggerContext ctx = LoggerContext.getContext(false);
        MarkerFilter auditMarkerFilter = MarkerFilter.createFilter(AUDIT_MARKER.getName(), Result.ACCEPT, Result.NEUTRAL);
        ctx.addFilter(auditMarkerFilter);
        ctx.updateLoggers();
        clusterService.getClusterSettings()
            .addSettingsUpdateConsumer(
                ignored -> {
                    LogManager.getLogger(Security.class)
                        .warn("Changing log level for [" + LoggingAuditTrail.class.getName() + "] has no effect");
                },
                List.of(Loggers.LOG_LEVEL_SETTING.getConcreteSettingForNamespace(LoggingAuditTrail.class.getName()))
            );