Pillar not getting applied?

Why would this:
```
# This could be expanded into another function to allow for
# reconfiguring more of the clickhouse_config_settings if we find we need
# it in the future.
def config_bg_pool_size(size=2):
    """When replacing a clickhouse node, we want to reduce the background
    pool size, because at the default of 8, it'll max out the
    resources on its peer nodes as it replicates data to itself.

    This changes that size, and re-runs the config with the background pool size set
    to the :size: argument.

    To restore this, you can just run :state.sls clickhouse.config:, or run this 
    module with the size set to the normal value.
    """
    config_key = 'clickhouse_profiles:default'
    new_pillar = { config_key: __salt__['pillar.get'](config_key, {})}
    new_pillar[config_key]['background_pool_size'] = size
    log.debug("Running state.sls with clickhouse.config, using pillar data: {}".format(new_pillar))
    state_result = __salt__['state.sls']('clickhouse.config', pillar=new_pillar)
    return state_result

```

Not modify the background pool size appropriate in 2019.2.0?