Recently, a common exception (org.apache.lucene.store.AlreadyClosedException: this Directory is closed) seen in multiple failed test cases.
FAILED: org.apache.solr.cloud.TestPullReplica.testKillPullReplica FAILED: org.apache.solr.cloud.SplitShardWithNodeRoleTest.testSolrClusterWithNodeRoleWithPull FAILED: org.apache.solr.cloud.TestPullReplica.testAddDocs I opened a JIRA and shared findings there. https://issues.apache.org/jira/browse/SOLR-17497
