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
commonFields.put(CLUSTER_NAME_FIELD_NAME, clusterName);
                        }
                    }
                    if (EMIT_CLUSTER_UUID_SETTING.get(settings)) {
                        final String clusterUuId = clusterState.metadata().clusterUUID();
                        if (Strings.hasLength(clusterUuId)) {
                            commonFields.put(CLUSTER_UUID_FIELD_NAME, clusterUuId);
                        }
                    }
                }
            }
            
            commonFields.putIfAbsent(NODE_NAME_FIELD_NAME, null);
            commonFields.putIfAbsent(NODE_ID_FIELD_NAME, null);
            commonFields.putIfAbsent(HOST_ADDRESS_FIELD_NAME, null);
            commonFields.putIfAbsent(HOST_NAME_FIELD_NAME, null);
            commonFields.putIfAbsent(CLUSTER_NAME_FIELD_NAME, null);
            commonFields.putIfAbsent(CLUSTER_UUID_FIELD_NAME, null);
            this.commonFields = Collections.unmodifiableMap(commonFields);
        }
        EntryCommonFields withNewSettings(Settings newSettings) {
            final Settings mergedSettings = Settings.builder().put(this.settings).put(newSettings, false).build();
            return new EntryCommonFields(mergedSettings, this.localNode, this.clusterService);
        }
        EntryCommonFields withNewLocalNode(DiscoveryNode newLocalNode) {
            return new EntryCommonFields(this.settings, newLocalNode, this.clusterService);
        }
    }
}