Monitor indicies and shards

Elastic Stack Elasticsearch
1

I'm looking for a way to monitor inside of the cluster like:

  • how many indices are available on my cluster,
  • how many shards each index has
  • and ...
    I know we can do it manually by GET _cluster/... commands but I'm looking for something like an exporter or so to do these commands in intervals.
2

Why not use the included Monitoring functionality?