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/test/java/org/elasticsearch/xpack/security/transport/filter/IPFilterTests.java
assertAddressIsAllowed("127.0.0.1");
        assertAddressIsDenied("8.8.8.8");
    }
    public void testThatAnAllowAllAuthenticatorWorks() throws Exception {
        Settings settings = Settings.builder().put("xpack.security.transport.filter.allow", "_all").build();
        ipFilter = new IPFilter(settings, auditTrailService, clusterSettings, licenseState);
        ipFilter.setBoundTransportAddress(transport.boundAddress(), transport.profileBoundAddresses());
        assertAddressIsAllowed("127.0.0.1");
        assertAddressIsAllowed("173.194.70.100");
    }
    public void testThatProfilesAreSupported() throws Exception {
        Settings settings = Settings.builder()
            .put("xpack.security.transport.filter.allow", "localhost")
            .put("xpack.security.transport.filter.deny", "_all")
            .put("transport.profiles.client.xpack.security.filter.allow", "192.168.0.1")
            .put("transport.profiles.client.xpack.security.filter.deny", "_all")
            .build();
        ipFilter = new IPFilter(settings, auditTrailService, clusterSettings, licenseState);
        ipFilter.setBoundTransportAddress(transport.boundAddress(), transport.profileBoundAddresses());
        assertAddressIsAllowed("127.0.0.1");
        
        assertAddressIsDenied(randomNonLocalIPv4Address());
        assertAddressIsAllowedForProfile("client", "192.168.0.1");
        assertAddressIsDeniedForProfile("client", "192.168.0.2");
    }
    public void testThatProfilesAreUpdateable() throws Exception {
        Settings settings = Settings.builder()
            .put("xpack.security.transport.filter.allow", "localhost")
            .put("xpack.security.transport.filter.deny", "_all")
            .put("transport.profiles.client.xpack.security.filter.allow", "192.168.0.1")