question: public Pair < SolrCore , SolrCore > replicateToDestination ( SolrCore bestsrcCore , SolrCore destinationCore ) throws Exception { Pair < SolrCore , SolrCore > replicationRequestPair = null ; try { SolrInteractionUtils . replicateIndex ( destinationCore . host , destinationCore . name , bestsrcCore . host , bestsrcCore . name ) ; String fullReplication = "http://%s:%s/solr/%s/replication?command=fetchindex&masterUrl=http://%s:%s/solr/%s" ; String replicator = String . format ( fullReplication , destinationCore . host , SolrInteractionUtils . DEFAULT_SOLR_PORT , destinationCore . name , bestsrcCore . host , SolrInteractionUtils . DEFAULT_SOLR_PORT , bestsrcCore . name ) ; logger . info ( "Using Replication Command -> " + replicator ) ; replicationRequestPair = new Pair < SolrCore , SolrCore > ( destinationCore , bestsrcCore ) ; logger . info ( "Adding Replication Request to the Queue: " + destinationCore . host + ":" + destinationCore . name + " --> " + bestsrcCore . host + ":" + bestsrcCore . name ) ; } catch ( Exception e ) { logger . info ( "Encountered Exception while Trying to connect to destination host " + destinationCore . host + " or source host" + bestsrcCore . host ) ; if ( ! replicatorConfig . shouldSkipReplicationFailures ( ) ) { throw new ReplicationFailureException ( "Replication failures while tyring to talk to nodes " + destinationCore . host + " or source host" + bestsrcCore . host ) ; } } return replicationRequestPair ; }
target:  Given source and Destionation Cores, Issue the Solr Replication Command between them