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() },
            randomFrom((ConfigurableClusterPrivilege[]) null, new ConfigurableClusterPrivilege[0]),
            new String[] { "jack", "nich*", "//\"" },
            Map.of("some meta", 42),
            Map.of()
        );
        Map<String, Object> metaMap = new TreeMap<>();
        metaMap.put("?list", List.of("e1", "e2", "*"));
        metaMap.put("some other meta", Map.of("r", "t"));
        RoleDescriptor roleDescriptor4 = new RoleDescriptor(
            "role_descriptor4",
            new String[] { "manage_ml", "grant_api_key", "manage_rollup" },
            new RoleDescriptor.IndicesPrivileges[] {
                RoleDescriptor.IndicesPrivileges.builder()
                    .indices("/. ? + * | { } [ ] ( ) \" \\/", "*")
                    .privileges("read", "read_cross_cluster")
                    .grantedFields("almost", "all*")
                    .deniedFields("denied*")
                    .build() },
            randomFrom((RoleDescriptor.ApplicationResourcePrivileges[]) null, new RoleDescriptor.ApplicationResourcePrivileges[0]),
            new ConfigurableClusterPrivilege[] { new ConfigurableClusterPrivileges.ManageApplicationPrivileges(Set.of("a+b+|b+a+")) },
            new String[] { "//+a+\"[a]/" },
            metaMap,
            Map.of("ignored", 2)
        );
        RoleDescriptor roleDescriptor5 = new RoleDescriptor(
            "role_descriptor5",
            new String[] { "all" },
            new RoleDescriptor.IndicesPrivileges[0],
            randomFrom((RoleDescriptor.ApplicationResourcePrivileges[]) null, new RoleDescriptor.ApplicationResourcePrivileges[0]),