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
/**
     * .http has been chosen for handling HTTP filters, which are not part of the profiles
     * The profiles are only handled for the transport protocol, so we need an own kind of profile
     * for HTTP. This name starts withs a dot, because no profile name can ever start like that due to
     * how we handle settings
     */
    public static final String HTTP_PROFILE_NAME = ".http";
    public static final Setting<Boolean> ALLOW_BOUND_ADDRESSES_SETTING = Setting.boolSetting(
        setting("filter.always_allow_bound_address"),
        true,
        Property.NodeScope
    );
    public static final Setting<Boolean> IP_FILTER_ENABLED_HTTP_SETTING = Setting.boolSetting(
        setting("http.filter.enabled"),
        true,
        Property.OperatorDynamic,
        Property.NodeScope
    );
    public static final Setting<Boolean> IP_FILTER_ENABLED_SETTING = Setting.boolSetting(
        setting("transport.filter.enabled"),
        true,
        Property.OperatorDynamic,
        Property.NodeScope
    );
    private static final IPFilterValidator ALLOW_VALIDATOR = new IPFilterValidator(true);
    private static final IPFilterValidator DENY_VALIDATOR = new IPFilterValidator(false);
    public static final Setting<List<String>> TRANSPORT_FILTER_ALLOW_SETTING = Setting.listSetting(
        setting("transport.filter.allow"),
        Collections.emptyList(),