Metacat

remove serial number from indexeventlog - it is not used elsewhere in the api. https://projects.ecoinformatics.org/ecoinfo/issues/5944

correct spelling for index.eventlog.classname property

use an independent ISet<SystemMetadata> structure to communicate objects that should be indexed by metacat-index. https://projects.ecoinformatics.org/ecoinfo/issues/5943

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.