ElasticSearch - How to merge indexes into one index?

Question

My cluster has an index for each day since a few months ago, 5 shards each index (the default), and I can\'t run queries on the whole cluster because there are too many shards (

Answer 1

You can use the reindex api.

POST _reindex
{
 "conflicts": "proceed",
 "source": {
   "index": ["twitter", "blog"],
   "type": ["tweet", "post"]
  },
  "dest": {
  "index": "all_together"
 }
}