Diversified sampler aggregation #

Like sampler, but the sample is diversified by a field — up to one (or few) documents per value — so rare categories survive the sampling.

Example #

Sample with at most one document per product type: all four types appear instead of being dominated by t-shirt:

Parameters for diversified_sampler #

• shard_size
  (Optional, integer, default: 100000) Sample size per shard.
• field
  (Required, string) Field used to diversify the sample.
• max_docs_per_value
  (Optional, integer, default: 1) Documents kept per distinct value.