question: public static void removeClusterFromHost ( DbClient dbClient , Host host ) { List < Initiator > initiators = ComputeSystemHelper . queryInitiators ( dbClient , host . getId ( ) ) ; for ( Initiator initiator : initiators ) { initiator . setClusterName ( "" ) ; dbClient . persistObject ( initiator ) ; } host . setCluster ( NullColumnValueGetter . getNullURI ( ) ) ; dbClient . persistObject ( host ) ; }
target:  Utility function to dissociate a host and its initiator from its cluster