The function " mpr.summary.search" won’t recognized the “is_magnetic” field:
Even though it is in the list of available fields:
The list of available fields is what you can request as return data from the API in the fields parameter. For some reason is_magnetic can be returned but not queried on. This is something I can add, but in the mean time I would suggest getting the data by querying on total_magnetization.
– Jason