consolidate SystemMetadata map retrieval in preparation for using a different structure for objects to index.
adding ability to remove event from the [error] queue.
Add code to implment set and get the last processed date.
It will make the index only for those objects which were modified after the marked time.
Add set and get the lastprocessedDate in the IndexEventLog.Remove the code to write the successful event.
Log the timed index jobs.
Add the code to log the failed events.
Add a temporary file log for debugging.
Add a serial number for the event.Add method to set events to be archived.
Add a new class variable - isArchived for class IndexEvent.
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