Shrink Index

  • Number of shards cannot be changed after index has been created, but...
  • New in version 5.x - index can be shrunk to smaller number of shards
  • Index must be in good health and in read-only state, can be achieved with following request:
    PUT /index-name/_settings
{
"settings": {
  "index.routing.allocation.require._name": "new-node-name", 
  "index.blocks.write": true 
}
}
  • Shrink Index is a single RESTful command:
    POST source-index/_shrink/target-index
  • Maybe specifically useful for logs: burst of writes followed by trickling reads

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