requests.js

PUT /syn
{
   "index": {
      "analysis": {
         "analyzer": {
            "synonym": {
               "tokenizer": "standard",
               "filter": [
                  "synonym"
               ]
            }
         },
         "filter": {
            "synonym": {
               "type": "synonym",
               "synonyms": [
                  "apple, orange, fruit",
                  "smoothie, shake, milkshake"
               ]
            }
         }
      }
   }
}

POST /syn/test/
{
   "title": "apple healthy smoothie"
}

POST /syn/test/
{
   "title": "apple healthy nutty super great more than 3 tokens smoothie"
}

GET /syn/test/_search
{
    "query": {
        "match": {
           "title": {
                "type": "phrase",
                "query": "orange milkshake",
                "slop": 3,
                "analyzer": "synonym"
           }
        }
    }
}

GET /syn/test/_search
{
    "query": {
        "match": {
           "title": {
                "type": "phrase",
                "query": "fruit shake",
                "slop": 3,
                "analyzer": "synonym"
           }
        }
    }
}

//Note that if you omit the analyzer (and use the default), 
//it won't find anything since the synonyms are not indexed
GET /syn/test/_search
{
    "query": {
        "match": {
           "title": {
                "type": "phrase",
                "query": "fruit shake",
                "slop": 3
           }
        }
    }
}