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
@Override
            protected boolean hasContent() {
                return false;
            }
            @Override
            protected BytesReference content() {
                throw new RuntimeException("should never be called");
            }
            @Override
            protected String expectedMessage() {
                return "";
            }
        };
        protected abstract boolean hasContent();
        protected abstract BytesReference content();
        protected abstract String expectedMessage();
    }
    private static PatternLayout patternLayout;
    private static String customAnonymousUsername;
    private static boolean reservedRealmEnabled;
    private Settings settings;
    private DiscoveryNode localNode;
    private ClusterService clusterService;
    private ThreadContext threadContext;
    private boolean includeRequestBody;
    private Map<String, String> commonFields;
    private Logger logger;
    private LoggingAuditTrail auditTrail;
    private ApiKeyService apiKeyService;
    @BeforeClass