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
filteredIndices.remove(0);
                if (filteredIndices.isEmpty() == false) {
                    allFilteredIndices.add(new ArrayList<>(filteredIndices));
                }
                filteredIndices.add("");
                settingsBuilder.putList("xpack.security.audit.logfile.events.ignore_filters.missingPolicy.indices", filteredIndices);
            } else {
                settingsBuilder.putList(
                    "xpack.security.audit.logfile.events.ignore_filters.missingPolicy.indices",
                    Collections.emptyList()
                );
            }
        }
        
        final List<String> filterPolicy = randomFrom(allFilteredIndices);
        final String[] filteredIndices = randomListFromLengthBetween(filterPolicy, 1, filterPolicy.size()).toArray(new String[0]);
        
        
        final List<String> unfilteredPolicy = randomFrom(allFilteredIndices);
        List<String> _unfilteredIndices;
        if (randomBoolean()) {
            _unfilteredIndices = randomListFromLengthBetween(unfilteredPolicy, 0, unfilteredPolicy.size());
            
            for (int i = 0; i < randomIntBetween(1, 4); i++) {
                _unfilteredIndices.add(UNFILTER_MARKER + randomAlphaOfLengthBetween(1, 4));
            }
        } else {
            _unfilteredIndices = randomListFromLengthBetween(unfilteredPolicy, 1, unfilteredPolicy.size());
            
            final List<String> otherIndices = randomNonEmptyListOfFilteredNames("other");