[request] Data too large, ...., which is larger than the limit of [7436828672/6.9gb]

场景:按字段"topic"分组去重,取前10个,类似sql的

count(distinct) top 10

GET topic/_search

{

  "size": 0,

  "query": {

    "match_all": {}

  },

  "aggregations": {

    "g1": {

      "terms": {

        "field": "topic",

        "size": 10,

        "order": {

          "g2": "desc"

        }

      },

      "aggregations": {

        "g2": {

          "cardinality": {

            "field": "topic_id"

          }

        }

      }

    }

  }

}

{

                "type":"circuit_breaking_exception",

                "reason":"[request] Data too large, data for [<reused_arrays>] would be [7572367360/7gb], which is larger than the limit of [7436828672/6.9gb]",

                "bytes_wanted":7572367360,

                "bytes_limit":7436828672,

                "durability":"TRANSIENT"

            }