Set Elastic to search in other language

Hello there!
I'm a new user of Elasticsearch and I'm trying to set my index to work with other language (with czech language). I have read some tutorials about analyzers and tryed to use the example code.
The problem is, when I try to run the code (in Kibana dev tools), I get an error:

{
  "error": {
    "root_cause": [
      {
        "type": "illegal_argument_exception",
        "reason": "keyword filter requires either `keywords` or `keywords_path` to be configured"
      }
    ],
    "type": "illegal_argument_exception",
    "reason": "keyword filter requires either `keywords` or `keywords_path` to be configured"
  },
  "status": 400
    }

The code I try to run looks like this:

PUT /university/_settings
{
  "settings": {
    "analysis": {
      "filter": {
        "czech_stop": {
          "type":       "stop",
          "stopwords":  "_czech_" 
        },
        "czech_stemmer": {
          "type":       "stemmer",
          "language":   "czech"
        }
      },
      "analyzer": {
        "czech": {
          "tokenizer":  "standard",
          "filter": [
            "lowercase",
            "czech_stop",
            "czech_stemmer"
          ]
        } } } } }

I have deleted the "keywords" part mentioned in the "tutorial" but I'm still getting the error. What am I doing wrong? Can you give me any advice please?
And the second thing I want to ask: is there anything more I have to do, if I want Elasticsearch to work with czech language, except this setting? I need it to work with search and fulltext search in czech language.

Many thanks for any reply and advice!

Experiencing the same problem, but then with the dutch settings. Update analyzer (stopwords)

Even found this issue, but it does not seem to conclude in a solution https://github.com/elastic/elasticsearch/issues/6613

Gotten any further with this?

Cheers