Hi Jorge,
I reviewed the searchserver-stdout.log file and noted an error message i.e.
[2018-03-02 12:36:18,189][WARN ][bootstrap ] unable to install syscall filter: syscall filtering not supported for OS: 'Windows Server 2012 R2'. Could you confirm what version of OS are you using for implementing this application?
Have you set minimum_master_nodes to the correct value (2 if you have 3 master eligible nodes)?
Below some messages in the ca_es_cluster.log.*
[2017-09-26 11:31:35,288][INFO ][cluster.service ] [CASDM_DAYSET] new_master {CASDM_DAYSET}{2funhFfLTJaqua216folbQ}{192.168.2.7}{CASDM_DAYSET/192.168.2.7:9300}, reason: zen-disco-join(elected_as_master, [0] joins received)