OSF: Used model.NewPointer everywhere (#27838)

```release-note
NONE
```

server/channels/api4/elasticsearch.go

@@ -30,7 +30,7 @@ func testElasticsearch(c *Context, w http.ResponseWriter, r *http.Request) {
 	// we set BulkIndexingTimeWindowSeconds to a random value to avoid failing on the nil check
 	// TODO: remove this hack once we remove BulkIndexingTimeWindowSeconds from the config.
 	if cfg.ElasticsearchSettings.BulkIndexingTimeWindowSeconds == nil {
-		cfg.ElasticsearchSettings.BulkIndexingTimeWindowSeconds = model.NewInt(0)
+		cfg.ElasticsearchSettings.BulkIndexingTimeWindowSeconds = model.NewPointer(0)
 	}
 	if checkHasNilFields(&cfg.ElasticsearchSettings) {
 		c.Err = model.NewAppError("testElasticsearch", "api.elasticsearch.test_elasticsearch_settings_nil.app_error", nil, "", http.StatusBadRequest)