Hi Everyone,

I hope you are safe and well. I am reaching out today to inquire about an 
error I received while running the solr stats migration tool for migrating 
stats from DSpace 5 to DSpace 6. We are on JSPUI 6.3,  we imported a small 
set of solr documents from our DSpace 5.9 environment and the error thrown 
states "*Exception: Type mismatch: id was indexed with multiple values per 
document, use SORTED_SET instead"*

Has anyone encountered this error while running the tool or has any tips 
for making this successful run? Thank you for reading, the full stack trace 
is below.

Best Regards,
Rachel

./dspace dsrun org.dspace.util.SolrUpgradePre6xStatistics
 * This process should be run iteratively over every statistics shard
 * until there are no remaining records with legacy ids present.
 * This process can be run while the system is in use.
 * It is likely to take 1 hour/1,000,000 legacy records to be udpated.
 *
 * This process will rewrite most solr statistics records and may 
temporarily double
 * the size of your statistics repositories.  Consider optimizing your solr 
repos when complete.
 * -------------------------------------------------------------------
No index name provided, defaulting to : statistics
Connecting to http://solrcloud-dev.vmdata.utl:8983/solr/tspace6-statistics

=================================================================
*** Statistics Records with Legacy Id ***

           6 Bistream View
           1 Community View
           0 Item View
           0 Collection View
--------------------------------------
           7 TOTAL
=================================================================

Exception: Type mismatch: id was indexed with multiple values per document, 
use SORTED_SET instead
org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: Type 
mismatch: id was indexed with multiple values per document, use SORTED_SET 
instead
at 
org.apache.solr.client.solrj.impl.HttpSolrServer.executeMethod(HttpSolrServer.java:552)
at 
org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:210)
at 
org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:206)
at 
org.apache.solr.client.solrj.request.QueryRequest.process(QueryRequest.java:91)
at org.apache.solr.client.solrj.SolrServer.query(SolrServer.java:301)
at 
org.dspace.util.SolrUpgradePre6xStatistics.updateRecords(SolrUpgradePre6xStatistics.java:495)
at 
org.dspace.util.SolrUpgradePre6xStatistics.run(SolrUpgradePre6xStatistics.java:454)
at 
org.dspace.util.SolrUpgradePre6xStatistics.main(SolrUpgradePre6xStatistics.java:366)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at 
org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:229)
at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:81)

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