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
private void setThreadContextField(ThreadContext threadContext, String threadContextFieldName, String auditLogFieldName) {
            final String fieldValue = threadContext.getHeader(threadContextFieldName);
            if (fieldValue != null) {
                logEntry.with(auditLogFieldName, fieldValue);
            }
        }
        LogEntryBuilder withAuthentication(Authentication authentication) {
            logEntry.with(PRINCIPAL_FIELD_NAME, authentication.getUser().principal());
            logEntry.with(AUTHENTICATION_TYPE_FIELD_NAME, authentication.getAuthenticationType().toString());
            if (authentication.isApiKey()) {
                logEntry.with(API_KEY_ID_FIELD_NAME, (String) authentication.getMetadata().get(AuthenticationField.API_KEY_ID_KEY));
                String apiKeyName = (String) authentication.getMetadata().get(AuthenticationField.API_KEY_NAME_KEY);
                if (apiKeyName != null) {
                    logEntry.with(API_KEY_NAME_FIELD_NAME, apiKeyName);
                }
                final String creatorRealmName = ApiKeyService.getCreatorRealmName(authentication);
                if (creatorRealmName != null) {
                    
                    logEntry.with(PRINCIPAL_REALM_FIELD_NAME, creatorRealmName);
                }
            } else {
                if (authentication.isRunAs()) {
                    logEntry.with(PRINCIPAL_REALM_FIELD_NAME, authentication.getLookedUpBy().getName())
                        .with(PRINCIPAL_RUN_BY_FIELD_NAME, authentication.getAuthenticatingSubject().getUser().principal())
                        
                        
                        .with(PRINCIPAL_RUN_BY_REALM_FIELD_NAME, authentication.getAuthenticatedBy().getName());
                    
                } else {
                    logEntry.with(PRINCIPAL_REALM_FIELD_NAME, authentication.getAuthenticatedBy().getName());