FORCELEADER not working - solr 6.6.1

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FORCELEADER not working - solr 6.6.1

Joe Obernberger
Hi All - sorry for the repeat, but I'm at a complete loss on this.  I
have a collection with 100 shards and 3 replicas each.  6 of the shard
will not elect a leader.  I've tried the FORCELEADER command, but
nothing changes.

The log shows 'Force leader attempt 1.  Waiting 5 secs for an active
leader'  It tries 9 times, and then stops.

The error that I get for a shard in question is:

org.apache.solr.common.SolrException: Error getting leader from zk for
shard shard21
     at org.apache.solr.cloud.ZkController.getLeader(ZkController.java:996)
     at org.apache.solr.cloud.ZkController.register(ZkController.java:902)
     at org.apache.solr.cloud.ZkController.register(ZkController.java:846)
     at
org.apache.solr.core.ZkContainer.lambda$registerInZk$0(ZkContainer.java:181)
     at
org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)
     at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
     at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
     at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.solr.common.SolrException: Could not get leader props
     at
org.apache.solr.cloud.ZkController.getLeaderProps(ZkController.java:1043)
     at
org.apache.solr.cloud.ZkController.getLeaderProps(ZkController.java:1007)
     at org.apache.solr.cloud.ZkController.getLeader(ZkController.java:963)
     ... 7 more
Caused by: org.apache.zookeeper.KeeperException$NoNodeException:
KeeperErrorCode = NoNode for /collections/UNCLASS/leaders/shard21/leader
     at
org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
     at
org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
     at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1151)
     at
org.apache.solr.common.cloud.SolrZkClient$7.execute(SolrZkClient.java:357)
     at
org.apache.solr.common.cloud.SolrZkClient$7.execute(SolrZkClient.java:354)
     at
org.apache.solr.common.cloud.ZkCmdExecutor.retryOperation(ZkCmdExecutor.java:60)
     at
org.apache.solr.common.cloud.SolrZkClient.getData(SolrZkClient.java:354)
     at
org.apache.solr.cloud.ZkController.getLeaderProps(ZkController.java:1021)
     ... 9 more

Please help.  Thank you!

-Joe