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/main/java/org/elasticsearch/xpack/security/audit/logfile/LoggingAuditTrail.java
return Optional.ofNullable(policyMap.get(policyName));
        }
        private synchronized void set(String policyName, EventFilterPolicy eventFilterPolicy) {
            policyMap = Maps.copyMapWithAddedOrReplacedEntry(policyMap, policyName, eventFilterPolicy);
            
            predicate = buildIgnorePredicate(policyMap);
        }
        Predicate<AuditEventMetaInfo> ignorePredicate() {
            return predicate;
        }
        private static Predicate<AuditEventMetaInfo> buildIgnorePredicate(Map<String, EventFilterPolicy> policyMap) {
            return policyMap.values().stream().map(EventFilterPolicy::ignorePredicate).reduce(x -> false, (x, y) -> x.or(y));
        }
        @Override
        public String toString() {
            final Map<String, EventFilterPolicy> treeMap = new TreeMap<>(policyMap);
            final StringBuilder sb = new StringBuilder();
            for (final Map.Entry<String, EventFilterPolicy> entry : treeMap.entrySet()) {
                sb.append(entry.getKey()).append(":").append(entry.getValue().toString());
            }
            return sb.toString();
        }
    }
    /**
     * Abstraction for the fields of the audit event that are used for filtering. If
     * an event has a missing field (one of `user`, `realm`, `roles` and `indices`)
     * the value for the field will be the empty string or a singleton stream of the
     * empty string.
     */
    static final class AuditEventMetaInfo {