Call the method TripleStoreService.destroy to delete the dataset.
Add the code to handle the merge-needed fields having multiple pairs.
During index merging process, if a field is a system metadata field and current document doesn't have the field, we don't need to merge it from the existing solr document.
Use a new class to overwrite the class RdfXmlSubprocessor in d1-processor since that one has a method to use solr http server directly.
Add the method PropertyConfigurator.configureAndWatch to monitor the change on log4j.properties file.
Add more log information.
Remove the import of JiBXException.
Replace the JiBXException by our own MashallingException.
Add a statement to help diagnose issues.
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