Add option for defining max shards per node

Proposal

We need to define cluster.max_shards_per_node Elasticsearch setting. This option should be optional. Maybe even define cluster.routing.allocation.total_shards_per_node which is per node setting.

Useful links

1. https://www.elastic.co/blog/how-many-shards-should-i-have-in-my-elasticsearch-cluster
2. https://www.elastic.co/guide/en/elasticsearch/reference/7.x/settings.html#cluster-setting-types
3. https://www.elastic.co/guide/en/elasticsearch/reference/7.x/modules-cluster.html#cluster-shard-limit