• 从诗词大会飞花令到elasticsearch原理解析
• 什么是倒排索引

• 聚合多组数据的时候可以在同一个aggs下面

  POST index/_search
  {
      "aggs": {
          "agg_terms": {
              "terms": {
                  "field": "field_one"
              }
          },
          "agg_sum": {
              "sum": {
                  "field": "field_two"
              }
          }
      }
  }

• 在mapping中加入aliases

  PUT index_name
  {
    "settings" : {
        "number_of_shards": 3,
        "number_of_replicas": 2
    },
    "mapping": {
        "_doc": {
            "properties": {
                "field": {
                    "type": "text"
                },
                "field": {
                    "type": "keyword"
                }
            }
        }
    },
    "aliases" : {
        "my_alias1" : {},
        "my_alias2" : {}
    }
  }

filters aggregation可以实现对类似条件的多次聚合filters aggregation

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