'Track content index requests.
Arguments:
event_name (str):  Name of the event to be logged.
category (str): category of indexed items
indexed_count (int): number of indexed items
Returns:
None'

@classmethod
def _track_index_request(cls, event_name, category, indexed_count):

    data = {'indexed_count': indexed_count, 'category': category}
    tracker.emit(event_name, data)
