使用向量搜尋集合

若要為新集合建立索引，請在開發工具主控台中傳送下列請求。根據預設，這會建立具有歐幾里得距離和 32 倍壓縮的索引。

PUT housing-index
{
  "settings": {
    "index.knn": true
  },
  "mappings": {
    "properties": {
      "housing-vector": {
        "type": "knn_vector",
        "dimension": 3,
        "space_type": "l2"
      },
      "title": {
        "type": "text"
      },
      "price": {
        "type": "long"
      },
      "location": {
        "type": "geo_point"
      }
    }
  }
}

若要使用不同的壓縮層級，請在欄位映射compression_level中設定 。下列範例會建立 索引，並將 compression_level設為 1 倍。

PUT housing-index-1x
{
  "settings": {
    "index.knn": true
  },
  "mappings": {
    "properties": {
      "housing-vector": {
        "type": "knn_vector",
        "dimension": 3,
        "compression_level": "1x",
        "space_type": "l2"
      },
      "title": {
        "type": "text"
      },
      "price": {
        "type": "long"
      },
      "location": {
        "type": "geo_point"
      }
    }
  }
}

支援的壓縮層級為 1 倍、2 倍、8 倍、16 倍和 32 倍。

若要將文件索引為 housing-index，您可以使用系統產生的 ID (POST) 或使用者提供的 ID (PUT)。

# System-generated document ID
POST housing-index/_doc
{
  "housing-vector": [10, 20, 30],
  "title": "2 bedroom in downtown Seattle",
  "price": "2800",
  "location": "47.71, 122.00"
}

# User-provided document ID
PUT housing-index/_doc/100
{
  "housing-vector": [10, 20, 30],
  "title": "2 bedroom in downtown Seattle",
  "price": "2800",
  "location": "47.71, 122.00"
}

若要搜尋與索引中屬性類似的屬性，請傳送下列查詢。根據預設，搜尋回應會從 排除原始向量_source，以減少延遲和承載大小。

GET housing-index/_search
{
  "size": 5,
  "query": {
    "knn": {
      "housing-vector": {
        "vector": [10, 20, 30],
        "k": 2
      }
    }
  }
}

回應會從 排除 housing-vector 欄位_source：

{
  "took": 10,
  "timed_out": false,
  "_shards": {
    "total": 0,
    "successful": 0,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 1,
      "relation": "eq"
    },
    "max_score": 1,
    "hits": [
      {
        "_index": "housing-index",
        "_id": "100",
        "_score": 1,
        "_source": {
          "price": "2800",
          "location": "47.71, 122.00",
          "title": "2 bedroom in downtown Seattle"
        }
      }
    ]
  }
}

開啟 Amazon OpenSearch Service 主控台。

在左側導覽窗格中，選擇集合，然後選取外殼集合。

選擇刪除並確認刪除。

若要為您的集合建立單一索引，請在開發工具主控台中傳送下列請求：

PUT housing-index-filtered
{
  "settings": {
    "index.knn": true
  },
  "mappings": {
    "properties": {
      "housing-vector": {
        "type": "knn_vector",
        "dimension": 3,
        "space_type": "l2",
        "method": {
          "name": "hnsw"
        }
      },
      "title": {
        "type": "text"
      },
      "price": {
        "type": "long"
      },
      "location": {
        "type": "geo_point"
      }
    }
  }
}

若要將單一文件索引為已housing-index-filtered，請傳送下列請求：

POST housing-index-filtered/_doc
{
  "housing-vector": [
    10,
    20,
    30
  ],
  "title": "2 bedroom in downtown Seattle",
  "price": "2800",
  "location": "47.71, 122.00"
}

若要以指定價格在地理點的指定距離內搜尋西雅圖的公寓，請傳送下列請求：

GET housing-index-filtered/_search
{
  "size": 5,
  "query": {
    "knn": {
      "housing-vector": {
        "vector": [
          0.1,
          0.2,
          0.3
        ],
        "k": 5,
        "filter": {
          "bool": {
            "must": [
              {
                "query_string": {
                  "query": "Find me 2 bedroom apartment in Seattle under $3000 ",
                  "fields": [
                    "title"
                  ]
                }
              },
              {
                "range": {
                  "price": {
                    "lte": 3000
                  }
                }
              },
              {
                "geo_distance": {
                  "distance": "100miles",
                  "location": {
                    "lat": 48,
                    "lon": 121
                  }
                }
              }
            ]
          }
        }
      }
    }
  }
}