We have a large site with a number of language versions, and an onsite Find server.

When upgrading to Find 9.6 we started to notice that we no longer got a search result when the current language was English.

Default language for our site is en-GB. en-IE and en-US is also enabled, but the language "en" is not.

We use unified search in the simplest form:

 SearchClient.Instance.UnifiedSearchFor(SearchString)

I notice from Fiddler that when the search is sendt to EpiFind server, a number of criteria on "PublishedInLanguage.en" is set.

{"range":{"PublishedInLanguage.en.StartPublish$$date":{"from":"0001-01-01T00:00:00Z","to":"2016-01-28T06:58:00Z","include_lower":true,"include_upper":true}}

Problem is that there are no "en" language in the index.

I've experimented with the "QueryEPiServer Find" page on the Elasticsearch admin.

This query yields no hits:

{
  "from": 0,
  "size": 10,
  "query": {
    "query_string": {
      "fields": [
        "SearchTitle$$string.sv"
      ],
      "query": "*"
    }
  },
  "filter": {
    "range": {
      "PublishedInLanguage.en.StartPublish$$date": {
        "from": "0001-01-01T00:00:00Z",
        "to": "2016-01-01T00:00:00Z",
        "include_lower": true,
        "include_upper": true
      }
    }
  },
  "fields": [
    "PublishedInLanguage",
    "SearchHitUrl$$string"
  ]
}

By manually adding -GB to the languagecode like this:

"PublishedInLanguage.en-GB.StartPublish$$date": {

the server returns "a lot of hits"

As far as I can see, the "language" parameter on UnifiedSearchFor does not differensiate between the "flavours" of "en".

Question: How can I tell unified search that languagecode en-GB should be used and not just en?

Thanks in advance!