Orchard corrupts Elastic stemmer configuration

[Lenar-Avia]

Describe the bug

Customer Elastic analyzers configuration from OrchardCore_Elasticsearch block gets corrupt

Orchard Core version

1.8.2

To Reproduce

Steps to reproduce the behavior:

1. Go to 'OrchardCore_Elasticsearch' section in configuration
2. Try to set up simple stemmer analyzer, SPANISH for example, as explained at:
   https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-lang-analyzer.html#spanish-analyzer
3. Make sure you have both "analyzer" and "filter" sections inside "analysis" block
4. Save and apply configuration
5. Check out current GET .../_settings of elastic - to find out there is no "analysis.filter" area.
   i.e. actual settings now do not contain "filter" area (on the same level as "analyzer")
6. Check out the termvectors to see that no handling happened to substrings.

Expected behavior

I would expect the termvectors to be created using stemmer.
When directly setting config using PUT ../_settings , custom morphological analyzer can be applied.

Logs and screenshots

Please try to reproduce the following settings using OrchardCore_Elasticsearch:

"analysis": {
  "filter": {
	"spanish_stop": {
	  "type":       "stop",
	  "stopwords":  "_spanish_" 
	},
	"spanish_stemmer": {
	  "type":       "stemmer",
	  "language":   "light_spanish"
	}
  },
  "analyzer": {
	"default": {
	  "tokenizer":  "standard",
	  "filter": [
		"lowercase",
		"spanish_stop",
		"spanish_stemmer"
	  ]
	}
  }
}

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[MikeAlhayek]

@Lenar-Avia I am not sure I follow your steps. But in order to create rebuilt_spanish you referenced, your configuration should look like the following:

"OrchardCore_Elasticsearch": {
  // ...
  "Analyzers": {
    "rebuilt_spanish": {
      "tokenizer":  "standard",
      "filter": [
        "lowercase",
        "spanish_stop",
        "spanish_keywords",
        "spanish_stemmer"
      ]
    }
  }
}

Can you see if the above works for you? Here is a reference from our documentation

[Lenar-Avia]

Hello, dear!
Well if i supply the request as you have provided, without the Analysis.Filters area,
then exception happens when i try to rebuild the index.
definitions: "index_not_found_exception" , "no such index [index_name]"
Your request is incomplete without Filters.

Also you ignore the fact that only "default" analyzer is working in OrchardCMS config
(i.e. it cannot be called rebuilt_spanish).
Please try to get a working stemmer configuration before removing the bug tag..

[MikeAlhayek]

Filters is not something we support in OC. Feel free to submit a PR that would add filters support in addition to the analyzers.

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