The following problem is due to the fact that curator checks the amount of available space on nodes that do not have the "master" role set. Please try using the option:
You can enter the option via "Custom Update".
At the same time, you can set the number of replicas using the option:
However, please note that the JOB will not end until the replica is created and the target index goes green.
We can terminate the JOB properly earlier using the parameter:
The final configuration of the JOB: