analyzer

The analyzer parameter specifies the analyzer used for text analysis when indexing or searching a text field.

Unless overridden with the search_analyzer mapping parameter, this analyzer is used for both index and search analysis. See Specify an analyzer.

The search_quote_analyzer setting allows you to specify an analyzer for phrases, this is particularly useful when dealing with disabling stop words for phrase queries.

To disable stop words for phrases a field utilising three analyzer settings will be required:

1. An analyzer setting for indexing all terms including stop words
2. A search_analyzer setting for non-phrase queries that will remove stop words
3. A search_quote_analyzer setting for phrase queries that will not remove stop words

 PUT my-index-000001 {
   "settings":{
      "analysis":{
         "analyzer":{
            "my_analyzer":{ 1
               "type":"custom",
               "tokenizer":"standard",
               "filter":[
                  "lowercase"
               ]
            },
            "my_stop_analyzer":{ 2
               "type":"custom",
               "tokenizer":"standard",
               "filter":[
                  "lowercase",
                  "english_stop"
               ]
            }
         },
         "filter":{
            "english_stop":{
               "type":"stop",
               "stopwords":"_english_"
            }
         }
      }
   },
   "mappings":{
       "properties":{
          "title": {
             "type":"text",
             "analyzer":"my_analyzer", 3
             "search_analyzer":"my_stop_analyzer", 4
             "search_quote_analyzer":"my_analyzer" 5
         }
      }
   }
}

PUT my-index-000001/_doc/1
{
   "title":"The Quick Brown Fox"
}

PUT my-index-000001/_doc/2
{
   "title":"A Quick Brown Fox"
}

GET my-index-000001/_search
{
   "query":{
      "query_string":{
         "query":"\"the quick brown fox\"" 6
      }
   }
}

1. my_analyzer analyzer which tokens all terms including stop words
2. my_stop_analyzer analyzer which removes stop words
3. analyzer setting that points to the my_analyzer analyzer which will be used at index time
4. search_analyzer setting that points to the my_stop_analyzer and removes stop words for non-phrase queries
5. search_quote_analyzer setting that points to the my_analyzer analyzer and ensures that stop words are not removed from phrase queries
6. Since the query is wrapped in quotes it is detected as a phrase query therefore the search_quote_analyzer kicks in and ensures the stop words are not removed from the query. The my_analyzer analyzer will then return the following tokens [the, quick, brown, fox] which will match one of the documents. Meanwhile term queries will be analyzed with the my_stop_analyzer analyzer which will filter out stop words. So a search for either The quick brown fox or A quick brown fox will return both documents since both documents contain the following tokens [quick, brown, fox]. Without the search_quote_analyzer it would not be possible to do exact matches for phrase queries as the stop words from phrase queries would be removed resulting in both documents matching.