Metacat

Add the timestamp for the printing out the start and end of hazelcast synchronization.

Add the log messages to indicate the hazelcast synchronization starting and ending.

Add the code to delete systemmetadata.

add support for v2 DataONE API.

Unify solr indexing with an IndexTask that is added to the queue -- allows us to send more than just the systemMetadata to the indexer. Initially this is for READ event counts for each document. https://projects.ecoinformatics.org/ecoinfo/issues/6346

only use MapStore/MapLoader for saving/loading IndexEvent objects. No need to use a listener since there is only the single node -- all entries are persisted to DB using the hazelcast.xml config we have for the map. https://projects.ecoinformatics.org/ecoinfo/issues/5944

add MapStore/Loader test for the IndexEvents -- adding and removing events in the DB table through hazelcast. https://projects.ecoinformatics.org/ecoinfo/issues/5944

stub for storing IndexEvent objects in Metacat (from metacat-index processing). https://projects.ecoinformatics.org/ecoinfo/issues/5944

do not force a get() during refresh (causing EML-defined data access rules to be lost when inserting EML docs about data files). note that this reverses a change that was meant to trigger indexing, but now we are using a new queue to share index events with metacat-index and so should not be necessary.

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