I am having trouble updating/reconfiguring a predefined Spark Context called "spark"

```
spark.sparkContext._conf.get("spark.app.name")

```

Returns the app name 'Databricks Shell' I want to update this and I try using:

```
spark.conf.set('spark.app.name', 'New_Name')

```

However this does not update anything, because when I again run

```
spark.sparkContext._conf.get("spark.app.name")

```

I still get 'Databricks Shell' How do I update or make any changes to the spark context?