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java.lang.NullPointerException: 	at org.apache.solr.handler.ReplicationHandler$4.postCommit(ReplicationHandler.java:922)	at org.apache.solr.update.UpdateHandler.callPostCommitCallbacks(UpdateHandler.java:78)	at org.apache.solr.update.DirectUpdateHandler2.commit(DirectUpdateHandler2.java:411)	at org.apache.solr.handler.SnapPuller.doCommit(SnapPuller.java:467)	at org.apache.solr.handler.SnapPuller.fetchLatestIndex(SnapPuller.java:319)