Can be updated over time
The following commands are given with curl for cli. The same requests can be made from postman or directly from the browser. If you do not want the json result data to appear pretty, you should remove the &pretty=true section at the end.
index meta file
curl -X GET http://es1:9200/index-name
search
curl -X GET http://es1:9200/index-name/_search?q=*:*&size=10
all indexes
curl -X GET http://es2:9200/_aliases?pretty=true