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What do you mean by aggregation in ElasticSearch?

Answer»

Aggregations in Elasticsearch ENABLE you to group data and calculate statistics on your data with a simple search query. In ElasticSearch, aggregations are categorized into three TYPES:

  • Bucket aggregations: Documents can be grouped into buckets by USING bucket aggregations. You can use them to CREATE data buckets or group data. A bucket can be formed based on existing field values, ranges, etc.
  • Metric aggregations: This aggregation HELPS to calculate metrics (such as a sum, or average) based on field values.
  • Pipeline aggregations: This type of aggregation takes inputs from the output results of other aggregates rather than individual documents or fields.


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