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
private volatile List<String> transportAllowFilter;
    private volatile List<String> transportDenyFilter;
    private volatile List<String> httpAllowFilter;
    private volatile List<String> httpDenyFilter;
    private final SetOnce<BoundTransportAddress> boundTransportAddress = new SetOnce<>();
    private final SetOnce<BoundTransportAddress> boundHttpTransportAddress = new SetOnce<>();
    private final SetOnce<Map<String, BoundTransportAddress>> profileBoundAddress = new SetOnce<>();
    private final Map<String, List<String>> profileAllowRules = Collections.synchronizedMap(new HashMap<>());
    private final Map<String, List<String>> profileDenyRules = Collections.synchronizedMap(new HashMap<>());
    public IPFilter(
        final Settings settings,
        AuditTrailService auditTrailService,
        ClusterSettings clusterSettings,
        XPackLicenseState licenseState
    ) {
        this.auditTrailService = auditTrailService;
        this.licenseState = licenseState;
        this.alwaysAllowBoundAddresses = ALLOW_BOUND_ADDRESSES_SETTING.get(settings);
        httpDenyFilter = HTTP_FILTER_DENY_SETTING.get(settings);
        httpAllowFilter = HTTP_FILTER_ALLOW_SETTING.get(settings);
        transportAllowFilter = TRANSPORT_FILTER_ALLOW_SETTING.get(settings);
        transportDenyFilter = TRANSPORT_FILTER_DENY_SETTING.get(settings);
        isHttpFilterEnabled = IP_FILTER_ENABLED_HTTP_SETTING.get(settings);
        isIpFilterEnabled = IP_FILTER_ENABLED_SETTING.get(settings);
        this.profiles = settings.getGroups("transport.profiles.", true)
            .keySet()
            .stream()
            .filter(k -> TransportSettings.DEFAULT_PROFILE.equals(k) == false)
            .collect(Collectors.toSet()); 
        for (String profile : profiles) {