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/AuditTrailServiceTests.java
Level.WARN,
                    "Auditing logging is DISABLED because the currently active license ["
                        + licenseState.getOperationMode()
                        + "] does not permit it"
                )
            );
        } else {
            mockLogAppender.addExpectation(
                new MockLogAppender.SeenEventExpectation(
                    "audit disabled because of license",
                    AuditTrailService.class.getName(),
                    Level.WARN,
                    "Auditing logging is DISABLED because the currently active license ["
                        + licenseState.getOperationMode()
                        + "] does not permit it"
                )
            );
        }
        for (int i = 1; i <= randomIntBetween(2, 6); i++) {
            service.get();
        }
        mockLogAppender.assertAllExpectationsMatched();
        Loggers.removeAppender(auditTrailServiceLogger, mockLogAppender);
    }
    public void testNoLogRecentlyWhenLicenseProhibitsAuditing() throws Exception {
        MockLogAppender mockLogAppender = new MockLogAppender();
        mockLogAppender.start();
        Logger auditTrailServiceLogger = LogManager.getLogger(AuditTrailService.class);
        Loggers.addAppender(auditTrailServiceLogger, mockLogAppender);
        service.nextLogInstantAtomic.set(randomFrom(Instant.now().minus(Duration.ofMinutes(5)), Instant.now()));