🔤 자동완성 & ngram 검색 전략

{
  "query": {
    "prefix": {
      "title": "카카"
    }
  }
}

{
  "settings": {
    "analysis": {
      "tokenizer": {
        "autocomplete_tokenizer": {
          "type": "edge_ngram",
          "min_gram": 1,
          "max_gram": 20,
          "token_chars": ["letter", "digit"]
        }
      },
      "analyzer": {
        "autocomplete": {
          "tokenizer": "autocomplete_tokenizer",
          "filter": ["lowercase"]
        },
        "autocomplete_search": {
          "tokenizer": "standard",
          "filter": ["lowercase"]
        }
      }
    }
  },
  "mappings": {
    "properties": {
      "title": {
        "type": "text",
        "analyzer": "autocomplete",
        "search_analyzer": "autocomplete_search"
      }
    }
  }
}

{
  "query": {
    "match": {
      "title": {
        "query": "카카"
      }
    }
  }
}

{
  "mappings": {
    "properties": {
      "suggest": {
        "type": "completion"
      }
    }
  }
}

{
  "suggest": {
    "title-suggest": {
      "prefix": "카카",
      "completion": {
        "field": "suggest"
      }
    }
  }
}