solr cloud shows slave(searching)

I am not using the master slave settings in solrconfig(as far as I know) but still solr admin page shows this in browser.

                  Version        Gen             Size

Master (Searching) 1444735428179 4390 5.4 GB

Master (Replicable) 1444735488272 4391 -

Slave (Searching) 1444735428184 4390 5.4 GB

I am not able to understand why it is showing slave part. Any help would be appreciated. Thanks