A collection of Elasticsearch curl commands and references. Get Cluster Health cluster health: curl -s http://localhost:9200/_cluster/health?pretty Get indices indices: curl -s http://localhost:9200/_cat/indices Get shards shards: curl -s http://localhost:9200/_cat/shards Stuck Unassigned Shards Sometimes shards fail to assign and they hit a maximum retry. For example, say there’s a replica shard that is unassigned and won’t assign. Running this command has it retry: curl -s -XPOST 'localhost:9200/_cluster/reroute?retry_failed' -H 'Content-Type: application/json' -d' { "commands" : [ { "allocate_replica" : { "index" : "INDEXNAME", "shard" : 0, "node" : "NODENAME" } } ] } ' In the above example, INDEXNAME is the index, NODENAME is the node.

The Unix command sed and some examples that I’ve used. sed cheatsheat : # label = # line_number a # append_text_to_stdout_after_flush b # branch_unconditional c # range_change d # pattern_delete_top/cycle D # pattern_ltrunc(line+nl)_top/cycle g # pattern=hold G # pattern+=nl+hold h # hold=pattern H # hold+=nl+pattern i # insert_text_to_stdout_now l # pattern_list n # pattern_flush=nextline_continue N # pattern+=nl+nextline p # pattern_print P # pattern_first_line_print q # flush_quit r # append_file_to_stdout_after_flush s # substitute t # branch_on_substitute w # append_pattern_to_file_now x # swap_pattern_and_hold y # transform_chars sed examples # grabs an SSH fingerprint (aka, using ssh-keyscan or the AWS System Log).