couchbase-cli cluster-init does not require an index storage mode, nor set a default

When using cluster-init to initialise a cluster it does not require an index storage mode to be set. This is not unusual as there are a few parameters that have a default value assumed if not explicitly specified (e.g '--cluster-index-ramsize' etc). What is frustrating is that this parameter ('--index-storage-settings') does not assume a default so you can end up with a cluster without a storage mode set.

Example:

$ ./couchbase-cli cluster-init --cluster-ramsize=300 --cluster-init-username=Administrator --cluster-init-password=password

SUCCESS: init/edit 127.0.0.1

In my opinion, couchbase-cli should assume a default setting or require the parameter to be passed.