more_like_this和group by

Question

是否可以将more_like_this和聚合结合起来获取类似文档并将其显示为分组？我可以在Elasticsearch中做到吗？

{
  "size": 12,
  "query": {
    "filtered": {
      "query": {
        "more_like_this": {
          "fields": [
            "summary_text", "description.orig"
          ],
          "docs": [
            {
              "_id": "9753"
            }enter code here
          ],
          "min_term_freq": 1,
          "max_query_terms": 12
        }
      }
    }
  },
  "aggs": {
    "by_product_class": {
      "terms": {
        "field": "product_class_id"
      }
    }
  }
}

Answer 1

是。在Elasticsearch 2.3中，您的聚合应该类似于：

{
  "size": 12,
  "query": {
    "more_like_this": {
      "fields": ["summary_text", "description.orig"],
      "like": [{
          "_index": "youIndex",
          "_type": "yourType",
          "_id": "9753"
        }],
      "min_term_freq": 1,
      "max_query_terms": 12
    }
  },
  "aggs": {
    "by_product_class": {
      "terms": {
        "field": "product_class_id"
      }
    }
  }
}

您可以在"like"数组中指定多个文档，甚至可以使用"doc": {"field1": x, "field2": y, ...}动态定义文档。 This是一个很好的参考。