The Replication screen shows you the current replication state for the core you have specified. SolrCloud has supplanted much of this functionality, but if you are still using Master-Slave index replication, you can use this screen to:
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View the replicatable index state. (on a master node)
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View the current replication status (on a slave node)
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Disable replication. (on a master node)
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Caution When Using SolrCloud
When using SolrCloud, do not attempt to disable replication via this screen. 
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More details on how to configure replication is available in the section called Index Replication.