Is it possible to create multiple index with multiple folder name

Elastic Stack Logstash
2

Yes, it is possible. Use gsub to extract folder name, then add in [@metadata][dir]
The best is to provide with dir name samples.

output {
   elasticsearch {
    hosts => ["http://localhost:9200"]
    index => "indexname_%{[@metadata][dir]}"
   } 
}

Other possibly is to set with IFs which is more strict and more usable in some cases.

output {
 if ([@metadata][dir]=="dir1"){
   elasticsearch {
    hosts => ["http://localhost:9200"]
    index => "indexname_%{[@metadata][dir]}"
   } 
 }
 else  if ([@metadata][dir]=="dir2"){
    elasticsearch {
    hosts => ["http://localhost:9200"]
    index => "indexname_%{[@metadata][dir]}"
   } 
 }
 else  if ([@metadata][dir]=="dir3"){
    elasticsearch {
    hosts => ["http://localhost:9200"]
    index => "indexname_%{[@metadata][dir]}"
   } 
 }