Dont work preference in es version 6

Elastic Stack Elasticsearch
1

I know that the preference custome string is a function that allows you to search with the same shard, but every time you search, a different shard is searched, so the search results of search after are strange.
What should I do?

search
indexname/_search?search_type=dfs_query_then_fetch&preference=hahahoho
{
  "sort": [
    {
      "_score": {
        "order": "desc"
      }
    },
    {
      "id": {
        "order": "desc"
      }
    }
  ], 
   "search_after": [value, value]
}

response
"_shard" : "[indexname][1]",
"_node" : "U7VmOV3ARkSuzMD1TcBvog",

or

"_shard" : "[indexname][1]",
"_node" : "hVZTf0ekRim3kAMKdPjBRg"
2

Hi @slowup,

The preference option does have a _shards option as per the documentation. It doesn't look like the example usage _shards:2,3 matches the string in your example. Have you also made sure that the shards option is listed first?

Can I confirm that you're using Elasticsearch v6.x? That version is past EOL so we would strongly recommend upgrading if you can.

3

hi @carly.richmond
thank u
I used Custom (string) value
Looking at the docs it says sending to the same shard, of course not always