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

• Shrink Index is brand new in version 5.x, it is ready for prime time? https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-shrink-index.html