code: async function _deleteManyHandler(model, request, Log) {
    try {
      // EXPL: make a copy of the payload so that request.payload remains unchanged
      let payload = request.payload.map(item => {
        return _.isObject(item) ? _.assignIn({}, item) : item
      })
      let promises = []
      for (let arg of payload) {
        if (JoiMongooseHelper.isObjectId(arg)) {
          promises.push(_deleteOneHandler(model, arg, false, request, Log))
        } else {
          promises.push(
            _deleteOneHandler(model, arg._id, arg.hardDelete, request, Log)
          )
        }
      }
  
      await Promise.all(promises)
      return true
    } catch (err) {
      handleError(err, null, null, Log)
    }
  }
docs: Deletes multiple documents.
  @param model: A mongoose model.
  @param request: The Hapi request object, or a container for the wrapper payload.
  @param Log: A logging object.
  @returns {object} A promise returning true if the delete succeeds.
  @private
   TODO: prevent Promise.all from catching first error and returning early. Catch individual errors and return a list TODO(cont) of ids that failed