Total bounds for all points to be index. These bounds are final, in that they may not be expanded later after indexing has begun. Typically this field does not need to be supplied as it will be inferred from the data itself. This field is specified as an array of the format [xmin, ymin, zmin, xmax, ymax, zmax].
{ "bounds": [0, 500, 30, 800, 1300, 50] }
https://github.com/connormanning/entwine/blob/master/doc/configuration.md#bounds