Thanks it works, makes sense.
Related to this however, I have tried to create a 'Proximity' Facet which connects to the google maps metabox field - the LAT/LONG of the address. It doesnt seem to work, nor does it register the location coordinates in the facetwp index table in db.
here is my map field
[
'id' => $prefix . 'map_lat_long',
'type' => 'map',
'name' => esc_html__( 'Map', 'text-domain' ),
'address_field' => 'building_address',
'api_key' => '...',
'region' => '.us',
'std' => '40.7831, -73.9712,14',
],
Thanks.