No indexes loaded for travel-sample if indexer storage mode is not specified during install

Use this command to install couchbase on any any centos 7 node:
python ./scripts/install.py -i local.ini -p version=<>,product=cb,parallel=true,vbuckets=1024,init_nodes=true

ini file example:
[global]
port:8091
username:root
password:couchbase

[servers]
1:SERVER_1

[SERVER_1]
ip:172.23.105.247
services=n1ql,kv,index

[membase]
rest_username:Administrator
rest_password:password

[tuq_client]
goroot:/root/n1ql/go
sherlock_path=/opt/couchbase/bin

When we login in UI, we dont see any indexer storage mode selected.
Before selecting storage mode I am able to load sample buckets and then I do not see anything in indexes tab, though all 3 samples get created.

testrunner does set the indexer mode when it starts a test.
Is there an issue with install.py file?