Add the EventLog code.
It will throw an exception if the subprocessor can't handle the document.
Check if the all components of a resource map have been processed before processing the resource map.
Fixed a bug that the event log can't save the real lastest process date.
Change the date format.Remove the replication part of log4j.
Use a new date format.
Add the code that only the ids with the correct system metadata modification time will be added to the index queue.
Add code to get and set the last process date.
move IndexEvent into metacat-common. Perparation for Metacat responding to events and writing them to a persistent store. https://projects.ecoinformatics.org/ecoinfo/issues/5944
refactor IndexEventLog a bit to simplify type/action information. prep for serializing IndexEvent objects to Metacat. https://projects.ecoinformatics.org/ecoinfo/issues/5944
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