Get all indexes:

curl -XGET "http://<IP>:9200/_cat/indices?pretty"

Stored sheds in the index:

curl -v -GET "<IP>:9200/<INDEXNAME>/_search?pretty=true&q=*:*"

Information about the cluster:

curl -XGET "http://<IP>:9200/_cluster/state?pretty"

Disable replica for a single index (for single node):

curl -XPUT "http://<IP>:9200/<index>/_settings?pretty"  -d '{ "index" : {"number_of_replicas" : 0}}'