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
Set<String> actions = Arrays.stream(generateRandomStringArray(4, 4, false)).collect(Collectors.toSet());
            return new ApplicationPrivilegeDescriptor(randomAlphaOfLength(4), randomAlphaOfLength(4), actions, metadata);
        })));
        auditTrail.accessGranted(requestId, authentication, PutPrivilegesAction.NAME, putPrivilegesRequest, authorizationInfo);
        List<String> output = CapturingLogger.output(logger.getName(), Level.INFO);
        assertThat(output.size(), is(2));
        String generatedPutPrivilegesAuditEventString = output.get(1);
        StringBuilder putPrivilegesAuditEventStringBuilder = new StringBuilder().append("""
            "put":{"privileges":[""");
        if (false == putPrivilegesRequest.getPrivileges().isEmpty()) {
            for (ApplicationPrivilegeDescriptor appPriv : putPrivilegesRequest.getPrivileges()) {
                putPrivilegesAuditEventStringBuilder.append("{\"application\":\"")
                    .append(appPriv.getApplication())
                    .append("\"")
                    .append(",\"name\":\"")
                    .append(appPriv.getName())
                    .append("\"")
                    .append(",\"actions\":[");
                if (appPriv.getActions().isEmpty()) {
                    putPrivilegesAuditEventStringBuilder.append("]");
                } else {
                    for (String action : appPriv.getActions()) {
                        putPrivilegesAuditEventStringBuilder.append("\"").append(action).append("\",");
                    }
                    
                    putPrivilegesAuditEventStringBuilder.deleteCharAt(putPrivilegesAuditEventStringBuilder.length() - 1);
                    putPrivilegesAuditEventStringBuilder.append("]");
                }
                putPrivilegesAuditEventStringBuilder.append(serializedMetadata).append("},");
            }