Endpoint for creating filter. Filter field contains object that are the params to filter on. All fields within this object contain parameters that have to be met to return objects as filtered. For example if labels field contains ["label1", "label2"] then all objects that have label1 and label2 will be returned.
Key field in single attribute object contains attribute_id of attribute that's value has to be matched with value field using operator. If operator is between then second_value field is used.
filter_by_polygons and filter_by_containers fields are used to filter objects by polygons and/or containers attributes respectively. attributes_for_container field is single form of container_ids field.