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
Map<String, Object> metadata = new TreeMap<>();
            metadata.put("smth", 42);
            metadata.put("list", List.of("42", 13));
            putUserRequest.metadata(metadata);
        }
        auditTrail.accessGranted(requestId, authentication, PutUserAction.NAME, putUserRequest, authorizationInfo);
        List<String> output = CapturingLogger.output(logger.getName(), Level.INFO);
        assertThat(output.size(), is(2));
        String generatedPutUserAuditEventString = output.get(1);
        StringBuilder putUserAuditEventStringBuilder = new StringBuilder().append("""
            "put":{"user":{"name":""")
            .append("\"")
            .append(putUserRequest.username())
            .append("\"")
            .append(",\"enabled\":")
            .append(putUserRequest.enabled())
            .append(",\"roles\":");
        if (putUserRequest.roles() == null) {
            putUserAuditEventStringBuilder.append("null");
        } else if (putUserRequest.roles().length == 0) {
            putUserAuditEventStringBuilder.append("[]");
        } else {
            putUserAuditEventStringBuilder.append("[");
            for (String roleName : putUserRequest.roles()) {
                putUserAuditEventStringBuilder.append("\"").append(roleName).append("\",");
            }
            
            putUserAuditEventStringBuilder.deleteCharAt(putUserAuditEventStringBuilder.length() - 1);
            putUserAuditEventStringBuilder.append("]");
        }