Update frozen-data-generation challenge to create frozen indices

[a03nikki]

Per the smoke-test.sh script,

# the order matters here as later challenges might expect that some indices already exist that have been created by challenges running earlier. In particular, these challenges are affected:
#
# * frozen-querying (depends on frozen-data-generation)

However, the frozen-data-generation challenge does not actually create frozen indices. Please update this challenge to do the set-up for the frozen-querying.

This challenge is a good choice for users who want to compare different hardware profiles for their Elasticsearch deployments using data_frozen node role and data tier.

Relates to #66.