SOLR-17972: Retry creation of ZK lock on connection loss. #3968
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https://issues.apache.org/jira/browse/SOLR-17972
This makes sure we don't skip creation of ZK distributed lock in case of a transient connection loss. This fix is only for when Solr is running with no overseer (distributed updates).
This change is for
9xbranch only, as this parameter is now ignored in10with the move to Curator.