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FessAdvent Calendar 2016

Day 7

Fess 検索クエリのブースト値を変更する

Posted at

Fess 10.3
検索クエリに設定するブースト値を変更します。

変更方法

  1. fess_config.propertiesを変更
  2. Fessを再起動
app/WEB-INF/classes/fess_config.properties
# boost
query.boost.title=0.1
query.boost.title.lang=0.5
query.boost.content=0.2
query.boost.content.lang=1.0

特定のフィールドを検索するときにブーストさせたい場合は
フィールドを追加することもできます。

確認方法

Query Boostの値を確認するにはFessのアプリ側のログレベルを変更します。

fess.in.sh
"$FESS_JAVA_OPTS -Dfess.log.level=debug"

Fessを再起動して検索するとfess.logで確認できます。

fess.log
DEBUG Query: {
  "from" : 0,
  "size" : 20,
  "query" : {
    "bool" : {
      "must" : {
        "function_score" : {
          "query" : {
            "bool" : {
              "should" : [ {
                "match" : {
                  "title" : {
                    "query" : "fess",
                    "type" : "phrase",
                    "boost" : 0.1
                  }
                }
              }, {
                "match" : {
                  "content" : {
                    "query" : "fess",
                    "type" : "phrase",
                    "boost" : 0.2
                  }
                }
              }, {
                "match" : {
                  "title_en" : {
                    "query" : "fess",
                    "type" : "phrase",
                    "boost" : 0.5
                  }
                }
              }, {
                "match" : {
                  "content_en" : {
                    "query" : "fess",
                    "type" : "phrase",
                    "boost" : 1.0
                  }
                }
              }, {
                "match" : {
                  "title_ja" : {
                    "query" : "fess",
                    "type" : "phrase",
                    "boost" : 0.5
                  }
                }
              }, {
                "match" : {
                  "content_ja" : {
                    "query" : "fess",
                    "type" : "phrase",
                    "boost" : 1.0
                  }
                }
              } ]
            }
          },
          "functions" : [ {
            "field_value_factor" : {
              "field" : "boost"
            }
          } ]
        }
      },
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