Me and my Colleague we are working on ELK stack on different machine but on same LAN . We both are using default ELK configurations i.e default yml settings . Now what is happening when I start my node and create some index my colleague can also see my created index and the name of my node has been added to his cluster and data replicates on both the machines . I have 2 questions hare ,why this is happening? ,can we stop this as we are in Dev stage and we both are doing R&D on ELK on 2 different machines ?.