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
Setting<List<String>> allowSetting = PROFILE_FILTER_ALLOW_SETTING.getConcreteSettingForNamespace(profile);
            profileAllowRules.put(profile, allowSetting.get(settings));
            Setting<List<String>> denySetting = PROFILE_FILTER_DENY_SETTING.getConcreteSettingForNamespace(profile);
            profileDenyRules.put(profile, denySetting.get(settings));
        }
        clusterSettings.addSettingsUpdateConsumer(IP_FILTER_ENABLED_HTTP_SETTING, this::setHttpFiltering);
        clusterSettings.addSettingsUpdateConsumer(IP_FILTER_ENABLED_SETTING, this::setTransportFiltering);
        clusterSettings.addSettingsUpdateConsumer(TRANSPORT_FILTER_ALLOW_SETTING, this::setTransportAllowFilter);
        clusterSettings.addSettingsUpdateConsumer(TRANSPORT_FILTER_DENY_SETTING, this::setTransportDenyFilter);
        clusterSettings.addSettingsUpdateConsumer(HTTP_FILTER_ALLOW_SETTING, this::setHttpAllowFilter);
        clusterSettings.addSettingsUpdateConsumer(HTTP_FILTER_DENY_SETTING, this::setHttpDenyFilter);
        clusterSettings.addAffixUpdateConsumer(PROFILE_FILTER_ALLOW_SETTING, this::setProfileAllowRules, (a, b) -> {});
        clusterSettings.addAffixUpdateConsumer(PROFILE_FILTER_DENY_SETTING, this::setProfileDenyRules, (a, b) -> {});
        updateRules();
    }
    public Map<String, Object> usageStats() {
        Map<String, Object> map = Maps.newMapWithExpectedSize(2);
        final boolean httpFilterEnabled = isHttpFilterEnabled && (httpAllowFilter.isEmpty() == false || httpDenyFilter.isEmpty() == false);
        final boolean transportFilterEnabled = isIpFilterEnabled
            && (transportAllowFilter.isEmpty() == false || transportDenyFilter.isEmpty() == false);
        map.put("http", httpFilterEnabled);
        map.put("transport", transportFilterEnabled);
        return map;
    }
    private void setProfileAllowRules(String profile, List<String> rules) {
        profileAllowRules.put(profile, rules);
        updateRules();
    }
    private void setProfileDenyRules(String profile, List<String> rules) {
        profileDenyRules.put(profile, rules);