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/LoggingAuditTrailTests.java
invalidateKeyEventStringBuilder.append("],");
        }
        if (Strings.hasLength(invalidateApiKeyRequest.getName())) {
            invalidateKeyEventStringBuilder.append("\"name\":\"").append(invalidateApiKeyRequest.getName()).append("\",");
        }
        invalidateKeyEventStringBuilder.append("\"owned_by_authenticated_user\":")
            .append(invalidateApiKeyRequest.ownedByAuthenticatedUser());
        if (Strings.hasLength(invalidateApiKeyRequest.getUserName()) || Strings.hasLength(invalidateApiKeyRequest.getRealmName())) {
            invalidateKeyEventStringBuilder.append("""
                ,"user":{"name":""");
            if (Strings.hasLength(invalidateApiKeyRequest.getUserName())) {
                invalidateKeyEventStringBuilder.append("\"").append(invalidateApiKeyRequest.getUserName()).append("\"");
            } else {
                invalidateKeyEventStringBuilder.append("null");
            }
            invalidateKeyEventStringBuilder.append(",\"realm\":");
            if (Strings.hasLength(invalidateApiKeyRequest.getRealmName())) {
                invalidateKeyEventStringBuilder.append("\"").append(invalidateApiKeyRequest.getRealmName()).append("\"");
            } else {
                invalidateKeyEventStringBuilder.append("null");
            }
            invalidateKeyEventStringBuilder.append("}");
        }
        invalidateKeyEventStringBuilder.append("}}");
        String expectedInvalidateKeyEventString = invalidateKeyEventStringBuilder.toString();
        assertThat(generatedInvalidateKeyAuditEventString, containsString(expectedInvalidateKeyEventString));
        generatedInvalidateKeyAuditEventString = generatedInvalidateKeyAuditEventString.replace(
            ", " + expectedInvalidateKeyEventString,
            ""
        );