Testing analyzers

The analyze API is an invaluable tool for viewing the terms produced by an analyzer. A built-in analyzer (or combination of built-in tokenizer, token filters, and character filters) can be specified inline in the request:

POST _analyze
{
  "analyzer": "whitespace",
  "text":     "The quick brown fox."
}

POST _analyze
{
  "tokenizer": "standard",
  "filter":  [ "lowercase", "asciifolding" ],
  "text":      "Is this déja vu?"
}

Alternatively, a custom analyzer can be referred to when running the analyze API on a specific index:

PUT my_index
{
  "settings": {
    "analysis": {
      "analyzer": {
        "std_folded": { 
          "type": "custom",
          "tokenizer": "standard",
          "filter": [
            "lowercase",
            "asciifolding"
          ]
        }
      }
    }
  },
  "mappings": {
    "_doc": {
      "properties": {
        "my_text": {
          "type": "text",
          "analyzer": "std_folded" 
        }
      }
    }
  }
}

GET my_index/_analyze 
{
  "analyzer": "std_folded", 
  "text":     "Is this déjà vu?"
}

GET my_index/_analyze 
{
  "field": "my_text", 
  "text":  "Is this déjà vu?"
}

Define a custom analyzer called std_folded.

The field my_text uses the std_folded analyzer.

To refer to this analyzer, the analyze API must specify the index name.

Refer to the analyzer by name.

Refer to the analyzer used by field my_text.