post https://{hostname}/entity.bulkCreate
Creates multiple user profiles with a single operation. Note that your request body can't be larger than 5 MB. If you encounter a client intended to send too large body
error you must reduce the size of the request body. For example, you might divide the list of accounts to be created in half and then use two operations instead of one. See Default user schema for information about that attributes that make up a standard Identity Cloud schema.