ES 5.2 refresh_interval doesn't work if set to 0

[Suyog_Kale]

Hello,

I used following API to set index refresh_interval to zero [yes, I want to refresh an index immediately ]

PUT localhost:9200/indexname/_settings
{
"index" : {
"refresh_interval" :"0"
}
}

GET localhost:9200/indexname/_settings

• result
  {
  "indexname": {
  "settings": {
  "index": {
  "refresh_interval": "0",
  "number_of_shards": "5",
  "provided_name": "indexname",
  "creation_date": "1489749844952",
  "number_of_replicas": "1",
  "uuid": "TKovyYpwRdeqsA__Qj0Pww",
  "version": {
  "created": "5020199"
  }
  }
  }
  }
  }

BUT IF I INSERT ANY NEW DOCUMENT, IT DOESN'T REFLECT AT ALL.

[dadoonet (David Pilato)]

I don't believe it can be set to 0. FWIW I believe that 0 means no refresh here.

But please even if this would be possible, never ever do such a thing.

Elasticsearch is not designed to provide real time search.
Going close to 0 is going to cost you a lot.

But why do you need this in the first place?

[Suyog_Kale]

Hi @dadoonet,

We need this only during development, default refresh_interval is 1s, which takes time if we have to verify during development.

So we want to set it for an immediate refresh once insert or update the document.

[dadoonet (David Pilato)]

Call refresh API in your tests https://www.elastic.co/guide/en/elasticsearch/reference/5.2/indices-refresh.html