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
MapBuilder<String, String> checkedFields = new MapBuilder<>(commonFields);
        checkedFields.remove(LoggingAuditTrail.ORIGIN_ADDRESS_FIELD_NAME);
        checkedFields.remove(LoggingAuditTrail.ORIGIN_TYPE_FIELD_NAME);
        checkedFields.put("type", "audit")
            .put(LoggingAuditTrail.EVENT_TYPE_FIELD_NAME, "security_config_change")
            .put(LoggingAuditTrail.EVENT_ACTION_FIELD_NAME, "invalidate_apikeys")
            .put(LoggingAuditTrail.REQUEST_ID_FIELD_NAME, requestId);
        assertMsg(generatedInvalidateKeyAuditEventString, checkedFields.map());
    }
    public void testSecurityConfigChangeEventFormattingForApplicationPrivileges() throws IOException {
        final String requestId = randomRequestId();
        final String[] expectedRoles = randomArray(0, 4, String[]::new, () -> randomBoolean() ? null : randomAlphaOfLengthBetween(1, 4));
        final AuthorizationInfo authorizationInfo = () -> Collections.singletonMap(PRINCIPAL_ROLES_FIELD_NAME, expectedRoles);
        final Authentication authentication = createAuthentication();
        final Map<String, Object> metadata = new TreeMap<>();
        final String serializedMetadata;
        if (randomBoolean()) {
            metadata.put("test", true);
            metadata.put("ans", 42);
            serializedMetadata = """
                ,"metadata":{"ans":42,"test":true}""";
        } else {
            metadata.put("ans", List.of(42, true));
            metadata.put("other", Map.of("42", true));
            serializedMetadata = """
                ,"metadata":{"ans":[42,true],"other":{"42":true}}""";
        }
        PutPrivilegesRequest putPrivilegesRequest = new PutPrivilegesRequest();
        putPrivilegesRequest.setRefreshPolicy(randomFrom(WriteRequest.RefreshPolicy.values()));
        putPrivilegesRequest.setPrivileges(Arrays.asList(randomArray(4, ApplicationPrivilegeDescriptor[]::new, () -> {