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
import org.elasticsearch.xpack.core.security.user.User;
import org.elasticsearch.xpack.security.audit.logfile.LoggingAuditTrail.AuditEventMetaInfo;
import org.elasticsearch.xpack.security.audit.logfile.LoggingAuditTrailTests.MockRequest;
import org.elasticsearch.xpack.security.audit.logfile.LoggingAuditTrailTests.RestContent;
import org.elasticsearch.xpack.security.authc.ApiKeyService;
import org.elasticsearch.xpack.security.rest.RemoteHostHeader;
import org.elasticsearch.xpack.security.support.CacheInvalidatorRegistry;
import org.elasticsearch.xpack.security.support.SecurityIndexManager;
import org.elasticsearch.xpack.security.transport.filter.SecurityIpFilterRule;
import org.elasticsearch.xpack.sql.proto.core.Nullable;
import org.junit.Before;
import org.mockito.Mockito;
import org.mockito.stubbing.Answer;
import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.time.Clock;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Random;
import java.util.stream.Collectors;
import static org.elasticsearch.xpack.security.audit.logfile.LoggingAuditTrail.PRINCIPAL_ROLES_FIELD_NAME;
import static org.elasticsearch.xpack.security.authc.ApiKeyServiceTests.Utils.createApiKeyAuthentication;
import static org.hamcrest.Matchers.is;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
public class LoggingAuditTrailFilterTests extends ESTestCase {