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/LoggingAuditTrailFilterTests.java
public void testRolesFilter() throws Exception {
        final Logger logger = CapturingLogger.newCapturingLogger(Level.INFO, null);
        final ThreadContext threadContext = new ThreadContext(Settings.EMPTY);
        final List<List<String>> allFilteredRoles = new ArrayList<>();
        final Settings.Builder settingsBuilder = Settings.builder().put(settings);
        for (int i = 0; i < randomIntBetween(1, 4); i++) {
            final List<String> filteredRoles = randomNonEmptyListOfFilteredNames();
            allFilteredRoles.add(new ArrayList<>(filteredRoles));
            settingsBuilder.putList("xpack.security.audit.logfile.events.ignore_filters.policy" + i + ".roles", filteredRoles);
        }
        
        
        final boolean filterMissingRoles = randomBoolean();
        if (filterMissingRoles) {
            if (randomBoolean()) {
                final List<String> filteredRoles = randomNonEmptyListOfFilteredNames();
                
                filteredRoles.remove(0);
                if (filteredRoles.isEmpty() == false) {
                    allFilteredRoles.add(new ArrayList<>(filteredRoles));
                }
                filteredRoles.add("");
                settingsBuilder.putList("xpack.security.audit.logfile.events.ignore_filters.missingPolicy.roles", filteredRoles);
            } else {
                settingsBuilder.putList("xpack.security.audit.logfile.events.ignore_filters.missingPolicy.roles", Collections.emptyList());
            }
        }
        
        final List<String> filterPolicy = randomFrom(allFilteredRoles);
        final String[] filteredRoles = randomListFromLengthBetween(filterPolicy, 1, filterPolicy.size()).toArray(new String[0]);