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使用 search_after 进行混合搜索

2.16 版本引入

您可以通过应用 search_after 条件来控制排序结果，该条件提供一个实时游标并使用前一页的结果来获取下一页的结果。有关 search_after 的更多信息，请参阅search_after 参数。

您可以通过在排序查询中应用 search_after 条件来对排序结果进行分页。

在以下示例中，按 doc_price 应用排序，并带有 search_after 条件。

GET /my-nlp-index/_search?search_pipeline=nlp-search-pipeline
{
  "query": {
    "hybrid": {
      "queries": [
        {
          "term": {
            "category": "permission"
          }
        },
        {
          "bool": {
            "should": [
              {
                "term": {
                  "category": "editor"
                }
              },
              {
                "term": {
                  "category": "statement"
                }
              }
            ]
          }
        }
      ]
    }
  },
  "sort":[
     {
        "doc_price": {
          "order": "desc"   
        }
     } 
  ],
  "search_after":[200]
}

响应包含在排序值 200 之后列出的匹配文档，按 doc_price 降序排序。

{
    "took": 8,
    "timed_out": false,
    "_shards": {
        "total": 3,
        "successful": 3,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 4,
            "relation": "eq"
        },
        "max_score": 0.5,
        "hits": [
            {
                "_index": "my-nlp-index",
                "_id": "6yaM4JABZkI1FQv8AwoM",
                "_score": null,
                "_source": {
                    "category": "permission",
                    "doc_keyword": "workable",
                    "doc_index": 4976,
                    "doc_price": 100
                },
                "sort": [
                    100
                ]
            },
            {
                "_index": "my-nlp-index",
                "_id": "7iaM4JABZkI1FQv8AwoN",
                "_score": null,
                "_source": {
                    "category": "editor",
                    "doc_index": 9871,
                    "doc_price": 30
                },
                "sort": [
                    30
                ]
            }
        ]
    }
}

在以下示例中，按 id 应用排序，并带有 search_after 条件。

GET /my-nlp-index/_search?search_pipeline=nlp-search-pipeline
{
  "query": {
    "hybrid": {
      "queries": [
        {
          "term": {
            "category": "permission"
          }
        },
        {
          "bool": {
            "should": [
              {
                "term": {
                  "category": "editor"
                }
              },
              {
                "term": {
                  "category": "statement"
                }
              }
            ]
          }
        }
      ]
    }
  },
  "sort":[
     {
        "_id": {
          "order": "desc"   
        }
     } 
  ],
  "search_after":["7yaM4JABZkI1FQv8AwoN"]
}

响应包含在排序值 7yaM4JABZkI1FQv8AwoN 之后列出的匹配文档，按 id 降序排序。

{
    "took": 17,
    "timed_out": false,
    "_shards": {
        "total": 3,
        "successful": 3,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 4,
            "relation": "eq"
        },
        "max_score": 0.5,
        "hits": [
            {
                "_index": "my-nlp-index",
                "_id": "7iaM4JABZkI1FQv8AwoN",
                "_score": null,
                "_source": {
                    "category": "editor",
                    "doc_index": 9871,
                    "doc_price": 30
                },
                "sort": [
                    "7iaM4JABZkI1FQv8AwoN"
                ]
            },
            {
                "_index": "my-nlp-index",
                "_id": "6yaM4JABZkI1FQv8AwoM",
                "_score": null,
                "_source": {
                    "category": "permission",
                    "doc_keyword": "workable",
                    "doc_index": 4976,
                    "doc_price": 100
                },
                "sort": [
                    "6yaM4JABZkI1FQv8AwoM"
                ]
            }
        ]
    }
}
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