Hi,
I am testing solr 6.6.3 and have been running into intermittent group
faceting errors.  I did some bulk indexing to  initially setup the
collection I have multiple facet fields it only throws error on one of the
fields. The issue goes away when I reindex the data.

<field name="category_id" type="tlong" indexed="true" stored="true" required
="false" multiValued="true" docValues="true"/>
 I am upgrading from solr 5.3, didn't see this issue with the existing
version we are using.  Any suggestions why this might be happening?

Exception during facet.field: category_id
  at
org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:612)
  at
org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:279)
  at
org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:268)
  at org.apache.solr.client.solrj.SolrClient.request(SolrClient.java:1219)
  at
org.apache.solr.handler.component.HttpShardHandler.lambda$submit$0(HttpShardHandler.java:163)
  at java.util.concurrent.FutureTask.run(Unknown Source)
  at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
  at java.util.concurrent.FutureTask.run(Unknown Source)
  at
com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)
  at
org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
Thanks
Jay
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