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How to move data from one Elasticsearch index to another using the Bulk API

I am new to Elasticsearch. How to move data from one Elasticsearch index to another using the Bulk API?

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I'd suggest using Logstash for this, i.e. you use one elasticsearch input plugin to retrieve the data from your index and another elasticsearch output plugin to push the data to your other index.

The config logstash config file would look like this:

input {
  elasticsearch {
   hosts => "localhost:9200"
   index => "source_index"           <--- the name of your source index
  }
}
filter {
 mutate {
  remove_field => [ "@version", "@timestamp" ]
 }
}
output {
 elasticsearch {
   host => "localhost"
   port => 9200
   protocol => "http"
   manage_template => false
   index => "target_index"           <---- the name of your target index
   document_type => "your_doc_type"  <---- make sure to set the appropriate type
   document_id => "%{id}"
   workers => 5
 }
}

After installing Logstash, you can run it like this:

bin/logstash -f logstash.conf

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