Elasticsearch layered ordering

Question

I would like to be able to return typeahead items in a certain order. For example, search for Para should return:

 Paracetamol

 Parafin

 LIQUI         


        

Answer 1

This is my suggestion (also, you need to enable scripting):

PUT /test
{
  "settings": {
    "analysis": {
      "analyzer": {
        "autocomplete": {
          "type": "custom",
          "tokenizer": "standard",
          "filter": [
            "standard",
            "lowercase",
            "ngram"
          ]
        },
        "search_ngram": {
          "type": "custom",
          "tokenizer": "keyword",
          "filter": "lowercase"
        }
      },
      "filter": {
        "ngram": {
          "type": "ngram",
          "min_gram": 2,
          "max_gram": 15
        }
      }
    }
  },
  "mappings": {
    "test": {
      "properties": {
        "text": {
          "type": "string",
          "index_analyzer": "autocomplete",
          "search_analyzer": "search_ngram",
          "index_options": "positions",
          "fields": {
            "not_analyzed_sorting": {
              "type": "string",
              "index": "not_analyzed"
            }
          }
        }
      }
    }
  }
}

---

POST test/test/_bulk
{"index":{"_id":1}}
{"text":"Paracetamol"}
{"index":{"_id":2}}
{"text":"Paracetamol xxx yyy zzz"}
{"index":{"_id":3}}
{"text":"Parafin"}
{"index":{"_id":4}}
{"text":"LIQUID PARAFFIN"}
{"index":{"_id":5}}
{"text":"ISOMETHEPTENE WITH PARACETAMOL"}

---

GET /test/test/_search
{
  "query": {
    "match": {
      "text": "Para"
    }
  },
  "sort": [
    {
      "_script": {
        "type": "number",
        "script": "termInfo=_index[field_to_search].get(term_to_search.toLowerCase(),_POSITIONS);if (termInfo) {for(pos in termInfo){return pos.position}};return 0;",
        "params": {
          "term_to_search": "Para",
          "field_to_search": "text"
        },
        "order": "asc"
      }
    },
    {
      "text.not_analyzed_sorting": {
        "order": "asc"
      }
    }
  ]
}

UPDATE

For your updated question, even if I would have preferred to have another post, use the following query:

{
  "query": {
    "match": {
      "text": "Para"
    }
  },
  "sort": [
    {
      "_script": {
        "type": "number",
        "script": "termInfo=_index[field_to_search].get(term_to_search.toLowerCase(),_POSITIONS);if (termInfo) {for(pos in termInfo){if (pos.position==0) return pos.position; else return java.lang.Integer.MAX_VALUE}};return java.lang.Integer.MAX_VALUE;",
        "params": {
          "term_to_search": "Para",
          "field_to_search": "text"
        },
        "order": "asc"
      }
    },
    {
      "text.not_analyzed_sorting": {
        "order": "asc"
      }
    }
  ]
}