[SOLVED] Why Redis JSON index creation/querying with non-English languages doesn't work?

Why Redis JSON index creation/querying with non-English languages doesn't work?

I create the index:

const searchSchema: any = {
  "$.Id": { type: SchemaFieldTypes.TEXT, AS: "Id", NOSTEM: true },
  "$.FirstName": {
    type: SchemaFieldTypes.TEXT,
    AS: "FirstName",
    LANGUAGE: RedisSearchLanguages.TURKISH,
  },
  "$.LastName": {
    type: SchemaFieldTypes.TEXT,
    AS: "LastName",
    LANGUAGE: RedisSearchLanguages.TURKISH,
  },
  "$.LicenseId": {
    type: SchemaFieldTypes.TEXT,
    AS: "LicenseId",
    NOSTEM: true,
  },
  "$.Specialties[*]": { type: SchemaFieldTypes.TAG, AS: "Specialties" },
  "$.SubSpecialties[*]": {
    type: SchemaFieldTypes.TAG,
    AS: "SubSpecialties",
  },
};

// Create a new index for the Doctor type
await client.ft.create(REDIS_JSON_INDEX, searchSchema, {
  ON: "JSON",
  PREFIX: REDIS_JSON_PREFIX,
  LANGUAGE: RedisSearchLanguages.TURKISH,
});

Then when I query for prefix/postfix expression with a Turkish character in it, it returns nothing. If I do the same query without prefix/postfix, it returns multiple items. I have tried passing using RedisSearchLanguages.TURKISH as above, tried 'turkish', 'tr'. Tried setting LANGUAGE on createOptions and on each individual field, still no luck.

FT.SEARCH 'doctors-index' "@FirstName:OĞUZ*" does not work

FT.SEARCH 'doctors-index' "@FirstName:OĞUZ" works

Solution

I ended up contacting Redis support and they told me that my Redisearch module was behind a version. Apparently they roll out updates in phases. There was no Unicode search in version 2.10.12. Once they bumped up the version to 2.10.13, the queries started to return results.