Statistics Sharding cannot recover from error

When attempting to run the command, it creates an initial solr core and then fails. The process cannot be restarted due to the existence of that solr core.

Based on my experience, I would not recommend this command to folks with older records in their statistics core.

Error (DSpace 4.2)
------------------------
Moving: 317727 into core statistics-2010
Exception: Document is missing mandatory uniqueKey field: uid
org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: Document is missing mandatory uniqueKey field: uid
at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:424)
at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:180)
at org.dspace.statistics.SolrLogger.shardSolrIndex(SolrLogger.java:1345)
at org.dspace.statistics.util.StatisticsClient.main(StatisticsClient.java:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:225)
at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:77)

Error (DSpace 3.x)
---------------------
[dspace@dspace-aux-1 ~]$ /opt/dspace/bin/dspace stats-util -s
INFO [main] (DSpaceKernelInit.java:52) - Created new kernel: DSpaceKernel:org.dspace:name=0f8afeda-81b7-4bd1-80d3-d73a7f686f32,type=DSpaceKernel:lastLoad=null:loadTime=0:running=false:kernel=null
INFO [main] (ConfigurationManager.java:1217) - Loading from classloader: file:/opt/dspace/config/dspace.cfg
INFO [main] (ConfigurationManager.java:1217) - Using dspace provided log configuration (log.init.config)
INFO [main] (ConfigurationManager.java:1217) - Loading: /opt/dspace/config/log4j.properties
Exception: org.apache.solr.client.solrj.response.QueryResponse.getFacetRanges()Ljava/util/List;
java.lang.NoSuchMethodError: org.apache.solr.client.solrj.response.QueryResponse.getFacetRanges()Ljava/util/List;
at org.dspace.statistics.SolrLogger.shardSolrIndex(SolrLogger.java:1184)
at org.dspace.statistics.util.StatisticsClient.main(StatisticsClient.java:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:183)

Error when attempting to re-run the command
----------------------------------------------------------
Exception: Error CREATEing SolrCore 'statistics-2010': Core with name 'statistics-2010' already exists.
org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: Error CREATEing SolrCore 'statistics-2010': Core with name 'statistics-2010' already exists.
at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:424)
at org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:180)
at org.apache.solr.client.solrj.request.CoreAdminRequest.process(CoreAdminRequest.java:462)
at org.dspace.statistics.SolrLogger.createCore(SolrLogger.java:1370)
at org.dspace.statistics.SolrLogger.shardSolrIndex(SolrLogger.java:1318)
at org.dspace.statistics.util.StatisticsClient.main(StatisticsClient.java:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:225)
at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:77)