Elasticsearch_CheatSheet.md

    Elasticsearch/Opensearch etc
    
    Info: Add "-u <username:password> --insecure" if the cluster uses https authentication.
    Tip: Add "?pretty" to the end of the API request to make the output more human readable.
    
    #Show cluster information
            curl -XGET https://localhost:9200/

    #Show cluster health
            curl -X GET https://localhost:9200/_cluster/health?pretty -u <username:password> --insecure

    #Show total indices
            curl -XGET https://localhost:9200/_cat/indices?pretty -u <username:password> --insecure
            or
            curl -v "localhost:9200/_cat/indices"

    #Show shards
            curl -XGET https://localhost:9200/_cat/shards?pretty -u <username:password> --insecure

    #Nodes overview
            curl -XGET http://localhost:9200/_cat/nodes?v

    #Check who is master
            curl -XGET http://localhost:9200/_cat/master?v

    #Delete an index
            curl -X DELETE 'http://localhost:9200/examples'

    #Delete status
            curl -XGET 'http://localhost:9200/_tasks?detailed=true&actions=*/delete/byquery&pretty'

    #Backup an index
            curl -XPOST --header 'Content-Type: application/json' http://localhost:9200/_reindex -d '{
                          "source": {
                          "index1": <"mainindex">
                          },
                          "dest": {
                          "index2": <"mainindex_copy">
                          }
                          }'

    #List all docs in an index
            curl -X GET 'http://localhost:9200/elasticsearch_query_examples/_search'

    #How many documents in the cluster overall
            curl -XGET http://localhost:9200/_cat/count?v

    #Shard info per index
            curl -XGET http://localhost:9200/_cat/shards/ruan-test?v

    #Shard allocation per node
            curl -XGET http://localhost:9200/_cat/allocation?v

    #Clear cache
            curl -XGET http://localhost:9200/_cache/clear

    #Create Index
            curl -XPUT http://localhost:9200/my2ndindex

    #Check pending tasks
            curl -XGET http://localhost:9200/_cat/pending_tasks?v
      
    #Query using URL parameters
            curl -X GET http://localhost:9200/samples/_search?q=school:Harvard
            
    #List index mapping
            curl -X GET http://localhost:9200/samples