The cordapp samples available in the samples repository uses a locally bootstrapped network. The network bootstrapper is used for this purpose to generate the node-info and the certificates of the network participants. It's a quick and easy way to set up a static Corda network for the purpose of local deployment and testing.
It doesn't have a network map service. The node-info files of each participant is dropped into the additional-node-info folder of the nodes which serves as the network map cache for the node.
The REST end-points you mentioned are available in a real network map service running as part of a dynamic Corda network setup (mostly) used for production deployments.
R3 does not provide a community version of the network map.
However, there is a commercial offering called CENM (https://docs.corda.net/docs/cenm/1.2.html). It's not just a Network Map but also takes care of other aspects of Network Management like Identity and Signing.
In case you are looking for an open-source network map you could try out Cordite Network Map (https://marketplace.r3.com/solutions/cordite-network-map) developed by one of our partners.