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
);
        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, "delete_privileges")
            .put(LoggingAuditTrail.REQUEST_ID_FIELD_NAME, requestId);
        assertMsg(generatedDeletePrivilegesAuditEventString, checkedFields.map());
    }
    public void testSecurityConfigChangeEventFormattingForRoleMapping() 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();
        PutRoleMappingRequest putRoleMappingRequest = new PutRoleMappingRequest();
        putRoleMappingRequest.setRefreshPolicy(randomFrom(WriteRequest.RefreshPolicy.values()));
        putRoleMappingRequest.setName(randomFrom(randomAlphaOfLength(8), null));
        putRoleMappingRequest.setEnabled(randomBoolean());
        putRoleMappingRequest.setRoles(Arrays.asList(randomArray(4, String[]::new, () -> randomAlphaOfLength(4))));
        putRoleMappingRequest.setRoleTemplates(
            Arrays.asList(
                randomArray(
                    4,
                    TemplateRoleName[]::new,
                    () -> new TemplateRoleName(
                        new BytesArray(randomAlphaOfLengthBetween(0, 8)),
                        randomFrom(TemplateRoleName.Format.values())
                    )
                )