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
checkedFields.remove(LoggingAuditTrail.ORIGIN_ADDRESS_FIELD_NAME);
        checkedFields.remove(LoggingAuditTrail.ORIGIN_TYPE_FIELD_NAME);
        checkedFields.put("type", "audit")
            .put(LoggingAuditTrail.EVENT_TYPE_FIELD_NAME, "security_config_change")
            .put(LoggingAuditTrail.EVENT_ACTION_FIELD_NAME, "delete_role_mapping")
            .put(LoggingAuditTrail.REQUEST_ID_FIELD_NAME, requestId);
        assertMsg(generatedDeleteRoleMappingAuditEventString, checkedFields.map());
    }
    public void testSecurityConfigChangeEventFormattingForUsers() throws IOException {
        final String requestId = randomRequestId();
        final String[] expectedRoles = randomArray(0, 4, String[]::new, () -> randomBoolean() ? null : randomAlphaOfLengthBetween(1, 4));
        final AuthorizationInfo authorizationInfo = () -> Collections.singletonMap(PRINCIPAL_ROLES_FIELD_NAME, expectedRoles);
        final Authentication authentication = createAuthentication();
        PutUserRequest putUserRequest = new PutUserRequest();
        String username = randomFrom(
            randomAlphaOfLength(3),
            customAnonymousUsername,
            AnonymousUser.DEFAULT_ANONYMOUS_USERNAME,
            UsernamesField.ELASTIC_NAME,
            UsernamesField.KIBANA_NAME
        );
        putUserRequest.username(username);
        putUserRequest.roles(randomFrom(randomArray(4, String[]::new, () -> randomAlphaOfLength(8)), null));
        putUserRequest.fullName(randomFrom(randomAlphaOfLength(8), null));
        putUserRequest.email(randomFrom(randomAlphaOfLength(8), null));
        putUserRequest.setRefreshPolicy(randomFrom(WriteRequest.RefreshPolicy.values()));
        putUserRequest.enabled(randomBoolean());
        putUserRequest.passwordHash(randomFrom(randomAlphaOfLengthBetween(0, 8).toCharArray(), null));
        boolean hasMetadata = randomBoolean();
        if (hasMetadata) {