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/audit/logfile/LoggingAuditTrailTests.java
.build(),
                RoleDescriptor.IndicesPrivileges.builder()
                    .indices("/@&~(\\.security.*)/")
                    .privileges("all", "cluster:a_wrong_*_one")
                    .build() },
            new RoleDescriptor.ApplicationResourcePrivileges[] {
                RoleDescriptor.ApplicationResourcePrivileges.builder()
                    .application("maps")
                    .resources("raster:*")
                    .privileges("coming", "up", "with", "random", "names", "is", "hard")
                    .build() },
            randomFrom((ConfigurableClusterPrivilege[]) null, new ConfigurableClusterPrivilege[0]),
            new String[] { "impersonated???" },
            randomFrom((Map<String, Object>) null, Map.of()),
            Map.of()
        );
        RoleDescriptor roleDescriptor3 = new RoleDescriptor(
            "role_descriptor3",
            randomFrom((String[]) null, new String[0]),
            randomFrom((RoleDescriptor.IndicesPrivileges[]) null, new RoleDescriptor.IndicesPrivileges[0]),
            new RoleDescriptor.ApplicationResourcePrivileges[] {
                RoleDescriptor.ApplicationResourcePrivileges.builder()
                    .application("maps")
                    .resources("raster:*")
                    .privileges("{", "}", "\n", "\\", "\"")
                    .build(),
                RoleDescriptor.ApplicationResourcePrivileges.builder()
                    .application("maps")
                    .resources("noooooo!!\n\n\f\\\\r", "{")
                    .privileges("*:*")