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
"cluster:monitor/nodes/liveness",
            "cluster:monitor/state",
            "indices:admin/template/*",
            "cluster:admin/component_template/*",
            "cluster:admin/ingest/pipeline/*",
            "cluster:admin/xpack/rollup/*",
            "cluster:admin/xpack/ccr/*",
            "cluster:admin/ilm/*",
            "cluster:admin/slm/*",
            "cluster:admin/xpack/enrich/*" };
        Random random = random();
        for (int i = 0; i < randomIntBetween(1, 4); i++) {
            Object name = actionPatterns[random.nextInt(actionPatterns.length)];
            filtered.add((String) name);
        }
        return filtered;
    }
    private RestRequest getRestRequest() throws IOException {
        final RestContent content = randomFrom(RestContent.values());
        final FakeRestRequest.Builder builder = new Builder(NamedXContentRegistry.EMPTY);
        if (content.hasContent()) {
            builder.withContent(content.content(), XContentType.JSON);
        }
        builder.withPath("_uri");
        final byte address[] = InetAddress.getByName(randomBoolean() ? "127.0.0.1" : "::1").getAddress();
        builder.withRemoteAddress(new InetSocketAddress(InetAddress.getByAddress("_hostname", address), 9200));
        builder.withParams(Collections.emptyMap());
        return builder.build();
    }
    private static class MockToken implements AuthenticationToken {