opensearch-docs-cn/_query-dsl/aggregations/bucket/diversified-sampler.md

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default	Diversified sampler	Bucket aggregations	Aggregations	40

Diversified sampler aggregations

The diversified_sampler aggregation lets you reduce the bias in the distribution of the sample pool. You can use the field setting to control the maximum number of documents collected on any one shard which shares a common value:

GET opensearch_dashboards_sample_data_logs/_search
{
  "size": 0,
  "aggs": {
    "sample": {
      "diversified_sampler": {
        "shard_size": 1000,
        "field": "response.keyword"
      },
      "aggs": {
        "terms": {
          "terms": {
            "field": "agent.keyword"
          }
        }
      }
    }
  }
}

Example response

...
"aggregations" : {
  "sample" : {
    "doc_count" : 3,
    "terms" : {
      "doc_count_error_upper_bound" : 0,
      "sum_other_doc_count" : 0,
      "buckets" : [
        {
          "key" : "Mozilla/5.0 (X11; Linux x86_64; rv:6.0a1) Gecko/20110421 Firefox/6.0a1",
          "doc_count" : 2
        },
        {
          "key" : "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)",
          "doc_count" : 1
        }
      ]
    }
  }
 }
}