Return sets of keywords derived from fields in ElasticSearch

问题

Im kinda new to this i need help, i looked online couldnt find any answer im looking for. Basically, what im trying to do is for autocomplete based on keywords derived from some textfields

Given an example of my indices:

"name": "One liter of Chocolate Milk"
"name": "Milo Milk 250g"
"name": "HiLow low fat milk"
"name": "Yoghurt strawberry"
"name": "Milk Nutrisoy"

So when i type in "mi", im expecting to get the results like:

"milk"
"milo"
"milo milk"
"chocolate milk" 
etc

Very good example is this aliexpress.com autocomplete

Thanks in advance

回答1:

That seems like a good use case for the shingle token filter

curl -XPUT localhost:9200/your_index -d '{
  "settings": {
      "analysis": {
        "analyzer": {
          "my_shingles": {
            "tokenizer": "standard",
            "filter": [
              "lowercase",
              "shingles"
            ]
          }
        },
        "filter": {
          "shingles": {
            "type": "shingle",
            "min_shingle_size": 2,
            "max_shingle_size": 2,
            "output_unigrams": true
          }
        }
      }
  },
  "mappings": {
    "your_type": {
      "properties": {
        "field": {
          "type": "string",
          "analyzer": "my_shingles"
        }
      }
    }
  }
}'

If you analyze Milo Milk 250g with this analyzer, you'll get the following tokens:

curl -XGET 'localhost:9200/your_index/_analyze?analyzer=my_shingles&pretty' -d 'Milo Milk 250g'

{
  "tokens" : [ {
    "token" : "milo",
    "start_offset" : 0,
    "end_offset" : 4,
    "type" : "<ALPHANUM>",
    "position" : 0
  }, {
    "token" : "milo milk",
    "start_offset" : 0,
    "end_offset" : 9,
    "type" : "shingle",
    "position" : 0
  }, {
    "token" : "milk",
    "start_offset" : 5,
    "end_offset" : 9,
    "type" : "<ALPHANUM>",
    "position" : 1
  }, {
    "token" : "milk 250g",
    "start_offset" : 5,
    "end_offset" : 14,
    "type" : "shingle",
    "position" : 1
  }, {
    "token" : "250g",
    "start_offset" : 10,
    "end_offset" : 14,
    "type" : "<ALPHANUM>",
    "position" : 2
  } ]
}

So when searching for mi, you'll get the following tokens:

• milo
• milo milk
• milk
• milk 250g

来源：https://stackoverflow.com/questions/42990382/return-sets-of-keywords-derived-from-fields-in-elasticsearch