You seem to have a typo somewhere in your files.
Also, unless you shared the wrong file, you have something wrong in your configuration.
In both elasticsearch.yml file that you shared you have the same initial master node, this is not possible as the clusters are different.
For the cluster named central, the node name is techbase, so the cluster.initial_master_nodes is correct.
But for the cluster named cliente_1, the node name is node-1, this should be the value of the cluster.initial_master_nodes, you can't use the techbase node because it is part of a different cluster.