文章目錄

• • 1. 上下文context suggester
  • 2. category index 操作
  • 3. category 查找
  • 4. geo index
  • 5. geo search

1. 上下文context suggester

completion suggester會考慮索引中的所有文檔，但有些情況下我們希望在復合一定的過濾條件的范圍內獲得suggest。例如，您想建議由某些藝術家的歌曲標題，或者您要根據其類型來提升某些歌曲標題的權重。

為了實現過濾或增強suggest，您可以在配置completion字段的mapping時添加上context mappings。可以為completion字段定義多個上context mappings。每個context mappings都有唯一的name和type。有兩種type：category 和 geo。上下文映射在字段映射中的contexts參數下配置。

使用樣例

PUT place {"mappings": {"properties" : {"suggest" : {"type" : "completion","contexts": [{ "name": "place_type", # 定義context的name"type": "category" # 定義context的類型,在index的時候必須提供這個context的內容},{ "name": "location","type": "geo","precision": 4}]}}} } PUT place_path_category {"mappings": {"properties" : {"suggest" : {"type" : "completion","contexts": [{ "name": "place_type","type": "category","path": "cat" # 定義了place_type context的內容從cat field讀取, 在index的時候不用再提供這個context的內容了，只需要提供cat的內容},{ "name": "location","type": "geo","precision": 4,"path": "loc" # 定義了location context對應的內容從loc field讀取}]},"loc": {"type": "geo_point"}}} }

2. category index 操作

PUT place/_doc/1 {"suggest": {"input": ["timmy's", "starbucks", "dunkin donuts"],"contexts": {"place_type": ["cafe", "food"] }} }PUT place_path_category/_doc/1 {"suggest": ["timmy's", "starbucks", "dunkin donuts"],"cat": ["cafe", "food"] }

3. category 查找

POST place/_search?pretty {"suggest": {"place_suggestion" : {"prefix" : "tim","completion" : {"field" : "suggest","size": 10,"contexts": {"place_type": [ "cafe", "restaurants" ]}}}} } POST place/_search?pretty {"suggest": {"place_suggestion" : {"prefix" : "tim","completion" : {"field" : "suggest","size": 10,"contexts": {"place_type": [ { "context" : "cafe" },{ "context" : "restaurants", "boost": 2 }]}}}} }

4. geo index

geo多了一個屬性交precision 定義了精度

PUT place/_doc/1 {"suggest": {"input": "timmy's","contexts": {"location": [{"lat": 43.6624803,"lon": -79.3863353},{"lat": 43.6624718,"lon": -79.3873227}]}} }

5. geo search

POST place/_search {"suggest": {"place_suggestion" : {"prefix" : "tim","completion" : {"field" : "suggest","size": 10,"contexts": {"location": {"lat": 43.662,"lon": -79.380}}}}} } POST place/_search?pretty {"suggest": {"place_suggestion" : {"prefix" : "tim","completion" : {"field" : "suggest","size": 10,"contexts": {"location": [ {"lat": 43.6624803,"lon": -79.3863353,"precision": 2},{"context": {"lat": 43.6624803,"lon": -79.3863353},"boost": 2}]}}}} }

總結

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