Efficient merging of index data stored in heterogeneous repositories

Elastic Stack Elasticsearch
1

I have some index data stored in hdfs (ES compatible indexing) and rest in
ES and also ES and hdfs clusters are different. Is there any other better
alternative than below options

  1. Bulk index request - but it is unnecessary as the data is already in
    indexed format
  2. Move/copy periodically hdfs to ES and merge indices in ES

Thanks

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