Elasticsearch

elasticearch.txt

curl -X PUT localhost:9200/books -d '
{
  "settings" : {
    "index" : {
      "analysis" : {
        "analyzer" : {
          "autocomplete_analyzer" : {
            "type" : "custom",
            "tokenizer" : "lowercase",
            "filter"    : ["asciifolding", "title_ngram"]
          }
        },
        "filter" : {
          "title_ngram" : {
            "type" : "nGram",
            "min_gram" : 3,
            "max_gram" : 5
          }
        }
      }
    }
  },

  "mappings": {
    "title": {
      "properties": {
        "title": {
          "type": "string",
          "analyzer": "autocomplete_analyzer"
        }
      }
    }
  }
}
'

curl "http://localhost:9200/books/_search?q=title=The"

Using cross fields

curl localhost:9200/books/_search -d '
{
  "query": {
    "multi_match": {
      "query": "Witness western",
      "type": "cross_fields",
      "fields": ["title^2", "genre"]
    }
  }
}
'

Boosting fields

Boost books which have classic genre

curl localhost:9200/books/_search -d '
{
  "query": {
      "bool": {
          "must": {
              "match": {
                  "title": {
                      "query":  "Trees",
                      "operator": "and"
                  }
              }
          },
          "should": [
              { "match": {
                  "genre": {
                      "query": "crime",
                      "boost": 3
                  }
              }}
          ]
      }
  }
}
'