Elasticsearch: Prefix query

“prefix” query matches documents that have fields containing terms with a specified prefix.

Add mappings to type “titles” like below.

PUT /books/_mappings/titles
{
 "titles" : {
  "properties" : {
   "title" :{
    "type" : "string",
    "index": "not_analyzed"
   }
  }
 } 
}

Insert below data into type “titles”.

PUT /_bulk
{"create" : {"_index": "books", "_type": "titles", "_id": "1" }}
{"id" : 1, "title" : "Courage: The Joy of Living Dangerously"}
{"create" : {"_index": "books", "_type": "titles", "_id": "2" }}
{"id" : 2, "title" : "Creativity: Unleashing the Forces Within"}
{"create" : {"_index": "books", "_type": "titles", "_id": "3" }}
{"id" : 3, "title" : "Joy: The Happiness That Comes from Within"}
{"create" : {"_index": "books", "_type": "titles", "_id": "4" }}
{"id" : 4, "title" : "Freedom: The Courage to Be Yourself "}
{"create" : {"_index": "books", "_type": "titles", "_id": "5" }}
{"id" : 5, "title" : "The Book of Secrets"}
{"create" : {"_index": "books", "_type": "titles", "_id": "6" }}
{"id" : 6, "title" : "Love, Freedom, and Aloneness: The Koan of Relationships"}
{"create" : {"_index": "books", "_type": "titles", "_id": "7" }}
{"id" : 7, "title" : "Life, Love, Laughter: Celebrating Your Existence"}

Get all books whose title starts with ‘L’.

GET /books/titles/_search
{
  "query":{
    "prefix": {
      "title": "L"
    }
  }
}

You will get following response.

{
   "took": 4,
   "timed_out": false,
   "_shards": {
      "total": 5,
      "successful": 5,
      "failed": 0
   },
   "hits": {
      "total": 2,
      "max_score": 1,
      "hits": [
         {
            "_index": "books",
            "_type": "titles",
            "_id": "6",
            "_score": 1,
            "_source": {
               "id": 6,
               "title": "Love, Freedom, and Aloneness: The Koan of Relationships"
            }
         },
         {
            "_index": "books",
            "_type": "titles",
            "_id": "7",
            "_score": 1,
            "_source": {
               "id": 7,
               "title": "Life, Love, Laughter: Celebrating Your Existence"
            }
         }
      ]
   }
}

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