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/transport/filter/IPFilter.java
Property.NodeScope
    );
    public static final Setting<List<String>> HTTP_FILTER_DENY_SETTING = Setting.listSetting(
        setting("http.filter.deny"),
        HTTP_FILTER_DENY_FALLBACK,
        Function.identity(),
        HTTP_FILTER_DENY_FALLBACK::get,
        DENY_VALIDATOR,
        Property.OperatorDynamic,
        Property.NodeScope
    );
    public static final Map<String, Object> DISABLED_USAGE_STATS = Map.of("http", false, "transport", false);
    public static final SecurityIpFilterRule DEFAULT_PROFILE_ACCEPT_ALL = new SecurityIpFilterRule(true, "default:accept_all") {
        @Override
        public boolean matches(InetSocketAddress remoteAddress) {
            return true;
        }
        @Override
        public IpFilterRuleType ruleType() {
            return IpFilterRuleType.ACCEPT;
        }
    };
    private static final Logger logger = LogManager.getLogger(IPFilter.class);
    private final AuditTrailService auditTrailService;
    private final XPackLicenseState licenseState;
    private final boolean alwaysAllowBoundAddresses;
    private volatile Map<String, SecurityIpFilterRule[]> rules = Collections.emptyMap();
    private volatile boolean isIpFilterEnabled;
    private volatile boolean isHttpFilterEnabled;
    private final Set<String> profiles;