SOLR-5552: Leader recovery process can select the wrong leader if all replicas for a shard are down and trying to recover as well as lose updates that should have been recovered.
SOLR-5569 A replica should not try and recover from a leader until it has published that it is ACTIVE.
SOLR-5568 A SolrCore cannot decide to be the leader just because the cluster state says no other SolrCore's are active.
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lucene/dev/trunk/solr/core/src/java/org/apache/solr/cloud/ElectionContext.java