Histogram aggregations

The histogram aggregation buckets documents based on a specified interval.

With histogram aggregations, you can visualize the distributions of values in a given range of documents very easily. Now OpenSearch doesn’t give you back an actual graph of course, that’s what OpenSearch Dashboards is for. But it’ll give you the JSON response that you can use to construct your own graph.

The following example buckets the number_of_bytes field by 10,000 intervals:

  1. GET opensearch_dashboards_sample_data_logs/_search
  2. {
  3.   "size": 0,
  4.   "aggs": {
  5.     "number_of_bytes": {
  6.       "histogram": {
  7.         "field": "bytes",
  8.         "interval": 10000
  9.       }
  10.     }
  11.   }
  12. }

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Example response

  1. ...
  2. "aggregations" : {
  3.   "number_of_bytes" : {
  4.     "buckets" : [
  5.       {
  6.         "key" : 0.0,
  7.         "doc_count" : 13372
  8.       },
  9.       {
  10.         "key" : 10000.0,
  11.         "doc_count" : 702
  12.       }
  13.     ]
  14.   }
  15.  }
  16. }