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
public String toString() {
            return "[users]:"
                + ignorePrincipalsPredicate.toString()
                + "&[realms]:"
                + ignoreRealmsPredicate.toString()
                + "&[roles]:"
                + ignoreRolesPredicate.toString()
                + "&[indices]:"
                + ignoreIndicesPredicate.toString()
                + "&[actions]:"
                + ignoreActionsPredicate.toString();
        }
    }
    /**
     * Builds the filter predicates for all the policies. Predicates of all policies
     * are ORed together, so that an audit event matching any policy is ignored.
     */
    static final class EventFilterPolicyRegistry {
        private volatile Map<String, EventFilterPolicy> policyMap;
        private volatile Predicate<AuditEventMetaInfo> predicate;
        private EventFilterPolicyRegistry(Settings settings) {
            final var entries = new ArrayList<Map.Entry<String, EventFilterPolicy>>();
            for (final String policyName : settings.getGroups(FILTER_POLICY_PREFIX, true).keySet()) {
                entries.add(entry(policyName, new EventFilterPolicy(policyName, settings)));
            }
            policyMap = Maps.ofEntries(entries);
            
            predicate = buildIgnorePredicate(policyMap);
        }
        private Optional<EventFilterPolicy> get(String policyName) {