anchor.diff:  The `custom` analyzer accepts the following parameters:
   
   [horizontal]
  +`type`::
  +    Analyzer type. Accepts <<analysis-analyzers, built-in analyzer types>>. For
  +    custom analyzers, use `custom` or omit this parameter.
  +
   `tokenizer`::
   
       A built-in or customised <<analysis-tokenizers,tokenizer>>.
  
positive.code:     "analysis": {
        "analyzer": {
          "my_custom_analyzer": { <1>
            "type": "custom",
            "char_filter": [
              "emoticons"
            ],
  
negative.code: }
  --------------------------------
  
  <1> For `custom` analyzers, use a `type` of `custom` or omit the `type`
  parameter.
  
  /////////////////////
  
  