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
queryString.append('&');
                }
                queryString.append(entry.getKey() + "=" + entry.getValue());
            }
            builder.withPath(uri + queryString.toString());
        }
        builder.withRemoteAddress(remoteAddress);
        builder.withParams(params);
        builder.withMethod(randomFrom(RestRequest.Method.values()));
        return new Tuple<>(content, builder.build());
    }
    
    protected static InetAddress forge(String hostname, String address) throws IOException {
        final byte bytes[] = InetAddress.getByName(address).getAddress();
        return InetAddress.getByAddress(hostname, bytes);
    }
    private Authentication createAuthentication() {
        return randomValueOtherThanMany(
            authc -> authc.getAuthenticationType() == AuthenticationType.INTERNAL,
            () -> AuthenticationTestHelper.builder().build()
        );
    }
    private AuthenticationToken createAuthenticationToken() {
        switch (randomIntBetween(0, 2)) {
            case 0:
                final ServiceAccountId accountId = new ServiceAccountId(randomAlphaOfLengthBetween(3, 8), randomAlphaOfLengthBetween(3, 8));
                return ServiceAccountToken.newToken(accountId, ValidationTests.randomTokenName());
            default:
                return mockToken();
        }