elasticsearch - Cardinality aggregation in elastic search - elastic - elastic search - elasticsearch tutorial - elasticsearch docker
- A single-value metrics aggregation that calculates an approximate count of distinct values. Values can be extracted either from specific fields in the document or generated by a script.
POST /index/_search?size=0 { "aggs" : { "type_count" : { "cardinality" : { "field" : "type" } } } }
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- Response:
{ ... "aggregations" : { "type_count" : { "value" : 3 } } }